according to the Rowe book his name was John Sanderson and they were married in 1752 (same year as daughter Jane was married!) in London, England

married in 1748, so prob b abt 1720-1728

Name: Stanhope Sanderson
Dates: 1726-1750
Location: Exeter
Occupation: attorney at law legal profession(a)
Gender: Male
Address(es): Exeter
Occupation(s): attorney at law, legal profession(a)
Source Date:1735
Source Info: Subscribed to The Statutes at large from Magna Charta to the seventh year of King George II. inclusive (Vol. 1), 1735, HAWKINS, William. London
Subject: law
Source Information: Ancestry.com. U.K. and U.S. Directories, 1680-1830 [database on-line]. Provo, UT, USA: MyFamily.com, Inc., 2003. Original data: Avero Publications. Biography Database, 1680-1830. Newcastle-upon-Tyne, England: Avero Publications, 1998.

IGI Individual Record FamilySearch™ International Genealogical Index v5.0
British Isles
JANE SCORE Female
Marriages:
Spouse:  STANHOPE SANDERSON
Marriage: 18 JAN 1748  Saint Sidwell, Exeter, Devon, England
Messages: Extracted marriage record for locality listed in the record. The source records are usually arranged chronologically by the marriage date.
Source Information: Batch No.: M050511 Dates: 1569 - 1837 Source Call No.: 0916840 Type: Film Printout Call No.: 1037052 Type: Film  Sheet: 00

JANE SANDERSON Female 
Christening: 01 MAY 1750 Holy Trinity, Exeter, Devon, England
Parents:
Father: STANHOPE SANDERSON
Mother: JANE
Messages: Extracted birth or christening record for the locality listed in the record.
Source Information: Batch No.: Dates: Source Call No.: Type: Printout Call No.: Type: 
C050901 1563 - 1837 0917200 Film 0883609  Film Sheet: 00
also in same batch:
WILLIAM SANDERSON Male
Christening: 16 OCT 1751 Holy Trinity, Exeter, Devon, England
Parents:
Father: STANHOPE SANDERSON
Mother: JANE
Messages: Extracted birth or christening record for the locality listed in the record.
Source Information: Batch No.: Dates: Source Call No.: Type: Printout Call No.: Type: 
C050901 1563 - 1837 0917200  Film 0883609  Film Sheet: 00
and
CHARLES SANDERSON Male 
Christening: 06 NOV 1754 Holy Trinity, Exeter, Devon, England
Parents:
Father: STANHOPE SANDERSON
Mother: JANE  
Messages: Extracted birth or christening record for the locality listed in the record.
Source Information: Batch No.: Dates: Source Call No.: Type: Printout Call No.: Type: 
C050901 1563 - 1837 0917200  Film 0883609  Film Sheet: 00


Devon, England: Parish and Probate Records - THESE RECORDS WERE DESTROYED BY THE NAZI’S BOMBING OF EXETER IN WW2
Devon & Cornwall: - Wills and Administrations proved in the Bishop of Exeter, 1559-1799
 Burials.
  Here begins the Alphabetical Calendar of Original Wills.
   1765.
County: Devonshire
Country: England
Sanderson, Stanhope, Exeter W. 1765
Devon: Exeter - Freemen 1266-1967
 1670
  Exeter Freemen
   1739 Roll of Freemen 1735-1740 and Mayor's Court Book 1727-1758
County: Devonshire
Country: England
Aug. 27 1739 Stanhope Sanderson, gent., fine of £1 1s

in google books
Calendars of wills and administrations relating to the counties of Devon and Cornwall, proved in the court of the principal registry of the bishop of Exeter, 1559-1799. And of Devon only, proved in the court of the archdeacontry of Exeter, 1540-1799. All now preserved in the Probate Registry at Exeter: Volumes 1-2 has been added to your library.
By Devonshire Association for the Advancement of Science, Literature and Art, Exeter (England). District Probate Registry, Church of England. Archdeaconry of Exeter. Court
p 180 1765 Stanhope Sanderson

England, Select Deaths and Burials, 1538-1991
Source Information: Ancestry.com. England, Select Deaths and Burials, 1538-1991 [database on-line]. Provo, UT, USA: Ancestry.com Operations, Inc., 2014.
Original data: England Deaths and Burials, 1538-1991. Salt Lake City, Utah: FamilySearch, 2013.
Name: Stanhope Sanderson
Death Place: Devon, England
Burial Date: 26 Dec 1764
Father:
Mother:
FHL Film Number: 916844
Reference ID: 19436 P171

WILL now on Ancestry!
England & Wales, Prerogative Court of Canterbury Wills, 1384-1858 for Stanhope Sanderson
PROB 11: Will Registers 1763-1767 Piece 926: Legard, Quire Numbers 51-98 (1767)
image 336-338 of 793 @ancestry
Source Citation: The National Archives; Kew, England; Prerogative Court of Canterbury and Related Probate Jurisdictions: Will Registers; Class: PROB 11; Piece: 926
Source Information
Ancestry.com. England & Wales, Prerogative Court of Canterbury Wills, 1384-1858 [database on-line]. Provo, UT, USA: Ancestry.com Operations, Inc., 2013.
Original data:: Prerogative Court of Canterbury: Wills of Selected Famous Persons. Digitized images. Records of the Prerogative Court of Canterbury, Series PROB 1. The National Archives, Kew, England.
Prerogative Court of Canterbury and Related Probate Jurisdictions: Will Registers. Digitized images. Records of the Prerogative Court of Canterbury, Series PROB 11. The National Archives, Kew, England.
Name: Stanhope Sanderson
Probate Date: 10 Feb 1767
Residence: Exon, Kent, England [City of Exon, England]

UK National Archives; Will of Stanhope Sanderson, Gentleman of Exon , Devon
Prerogative Court of Canterbury and related Probate Jurisdictions: Will Registers. Will of Stanhope Sanderson, Gentleman of Exon , Devon.
Collection: Records of the Prerogative Court of Canterbury
Date range: 10 February 1767
Reference:PROB 11/926/107
Subjects:Wills and probate
Stanhope Sanderson will transcribed
P1
I Stanhope Sanderson of the city of Exon?Gem? do give all my ….. lands ?tenorments? and … whatsoever both real and personal to John Twhake of Soskoard Espquire and Isugh Bownman of Alphington Esquire their … executors and admors in trust to be sold to the best purhasor or puschaor that can be got for the same and therewith to all my jusr debts and to plate the ocerplus of the money to arise by sale thereof out at interest on real securities or in the public funds at his or their discretion until my son and daughter Charles and Jane shall attain their age or ages of twenty one years and to apply the interest and profits thereof in the fraintimar and education hereby giving power to my said trustees to bestow and apply any part of the provision made for my said son and daughter in … them of either of them to any ?housings? or professions at their discretion and froma nad after their attaining their respective ages of twenty one years then I do hereby direct the overplus of the money to arises by sale as aforesaid shall be divided between them
P2
share and share alike and in case … of them shall happen to die before his or her attaining the said age of 21 then the share of him or her so dying shall be also paid to the survivor of them on his of her attaining the age of 21 as aforesaid and further I do hereby declare that the … of my said trustees or the survivor of them his …… to the purchasor or purchasors of my real and personal estate shall be sufficient ……. to … purchasor or purchasors respectively and that they or any of them shall not from and after the taking of such ….. amountable for such purchase ?money? or any part therof and I whereas the legal astate of and all the manors ……. lands and ?Screditaments? whereof John …. late of ?Barley/Marley? Esquire dyed ?soized? is now vested in me as the only actinf trustee under the last will and testament of the said John ?Pomloft? for the purposes therein mentioned therefore I do devise then said legal Estate of and in all and singular the same premies and all and every the trust and trusts vested in me by the said will and all and every other legal estate trust or trusts vested in me of and in any manors mofsuages lands and Lscreditoments whatsoever and?..ever for any use or uses trusts or purposes whatsoever into the said Isugh Downing Esq for his speirs or afsigns to the use of him his speirs or afsigns for ever But upon the same trusts and for the same purpoese and for the benefit of such or the same persons for whia the same were originall treated and further I will and direct that my said trustees and eecutors shall and amy at their discretion compound with any debtor or debtors to my said estate and take such satisfaction as can be procured by such composition in discharge of such debt or debts respectively and also to submit to arbitrarion any difference or dispute which may arise in and about my estates and Toureous and to perform the award of such arbitrators of umpire and I do declare that my said trustees shall only be accountable foe their own acts and not for the acts of one another and shall be always indemnified in whatsoever the shal respectively howfully do in the execution of the trusts to informed in the my will and I do release my mother and sister from any demands I may have against them and I do herby revoke any former will by me heretofore made and declare these presents to be and maintain my last will and testament and lastly I do hereby devise that the care tuition and guardianship of both my said children be left to my sister in law Elizabeth Score and the said Isugh Downman unitl they shall … attain their respective age of 21 years and do ….. their care and attention to this my appointment for the benefit and happiness of my said children ….whereof I have heremit set my hand and seal and published the same to be my last will this 17th day of December 1764 -Stanhope Sanderson- signed sealed published and … by the said Stanhope Sanderson as law for his last will and testament in the presence of witnesses
P3
who at his instance and request have hereunto subscribed our names as witnesses as well in his presence as also in the presence of each other after informing the word seventeenth instead of the word fifteenth.

On the 10th day of February in the year of out Lord 1767 administration ….of the goods chattels and credits of Stanhope Sanderson late of the city of Exstor decesed was granted to John Trehowes abd Isugh Downing respectively trustees in trus names in the said will for that no executor is named therin the heving been first sworn by … duty to administer

Devon: Exeter - Freemen 1266-1967/1670
  Exeter Freemen
  1776 Roll of Freemen 1767-1777 and Mayor's Court Memorandum Book 1767-1776
County: Devonshire
Country: England
Sept. 2 1776 Charles Sanderson, fuller, son of Stanhope Sanderson, by succession

ALSO this litigation at Nat Arch UK
http://discovery.nationalarchives.gov.uk/SearchUI/Details?uri=C10485368
Short title: Sawle v Earl Godolphin.
Document type: Two bills and two answers.
Collection: Records created, acquired, and inherited by Chancery, and also of the Wardrobe, Royal Household, Exchequer and various commissions
Date range: 1758
Reference:C 11/1876/21
Subjects:Litigation | Children
Description:
Plaintiffs: Richard Sawle, woollen draper of St Mary le Strand, Middlesex, Bridget Sawle and Elizabeth Sawle infants (by said Richard Sawle, their father), (devisees of John Penneck, esq deceased, late of Barley, Devon).

Defendants: Francis [Godolphin] Earl Godolphin, Thomas Augustus Cruwys, George Blewett, Henry Cruwys, John Penneck, clerk, Richard King, Alexander Cumming and Grace Cumming his wife, John Ley, Stanhope Sanderson, Thomas Glynn, and John Frewren.
Date of bill (or first document): 1758
Note: The naming of a party does not imply that he or she will appear in all the documents in this cause (after the bill)
Held by: The National Archives, Kew; Legal status: Public Record


ALSO this litigation -
http://discovery.nationalarchives.gov.uk/SearchUI/Details?uri=C10449066
Short title: Shrimpton v Neat.
Document type: Two bills and two answers.
Collection: Records created, acquired, and inherited by Chancery, and also of the Wardrobe, Royal Household, Exchequer and various commissions
Date range: 1734
Reference:C 11/517/44
Subjects:Litigation
Description:
Plaintiffs: Thomas Shrimpton, esq of Exeter Devon (only son and heir of Thomas Shrimpton, gent deceased late of Westminster, Middlesex, who was an elder brother of Major General John Shrimpton, deceased, who was late father of Philip Shrimpton, esq deceased late of St James Westminster, Middlesex).

Defendants: Charles Stanhope, esq and Cecilia Stanhope his wife, Thomas Neat and John Neat.
Date of bill (or first document): 1734
Note: The naming of a party does not imply that he or she will appear in all the documents in this cause (after the bill)
Held by: The National Archives, Kew; Legal status:Public Record