David Price said they were twins, listed with same age on 1871UKC

FreeBMD Births Jun 1862
PRICE  Issiah; Merthyr T, vol 11a, pg 322 born at 5:40am
PRICE Jacob; Merthyr T, vol 11a, pg 322 born at 5:50am
1871UKC Wm Price & fam; Wales; Glamorgan; Ystradyfodwg; Ystradyfodwg; District 4a; image 32-33 of 85 @ ancestry.com; Source information: RG10/5384; Registration district: Pontypridd; Sub-registration district: Ystradyfodwg; ED, institution, or vessel: 4a; Folio: 18; Page: 30; Household schedule number: 116; GSU Number: 849479

FReeBMD Marriages Sep 1882  MC#WMXZ163984
Price Jacob Pontypridd 11a 483
10 july 1882 in the parish church after banns
Jacob 21 yrs, bachelor, Hauler, Treorky, father William Price- deceased, collier
Rachel Griffiths 22 yrs spinster, Troherkert, father John Grifiths, collier

1891UKC Jacob Price and family; Wales Census > Glamorgan > Llangeinor > District 8; image 141 of 148 @ancestry.com; Source Citation: Class: RG12; Piece: 4452; Folio 90; Page 141; GSU roll: 6099562.
Jacob Price 30
Rachael Price 30
Williams J Price 8
Mary A Price 6
Evan Price 11/12
Edward J Davies 19 boarder
John H Davies 19 boarder
Benjamin H Jenkins 19 boarder
Jeffra Price 20 visitor -POSS brother, listed also with mother Martha
Ann Cosslett 18- listed directly under Jeffrey, not with boarders, could be running off to get mearried?