I confess that I've been terribly confused too until some clarification in your last posting.
Since online records for Oxfordshire are virtually non-existent it's hard to confirm the details for marriages/baptisms you quote. Where did you get the information of the 2 baptisms for Lydia and James?
Since there is no sign of William and Ann Horton in census records one presumes both were deceased by 1841.
How do you know there was a sister Mary and a brother William anyway?
(A Mary Ann Horton was baptised 27/4/1815 Birmingham dau. of a William and Ann but this William was just a labourer, not a farmer) but no William with these parents)
Annette
Hi, i am sorry for the confusion, i should have been more precise. I have a relation in York who descends from Mary Horton, where as i descend from Lydia.
William Horton (labourer) m Ann Willis (Lodger) st Aldate Oxford 1811. Lydia and James parents.
In the 1841 census Oxford Lydia Hortons brother James bapt 1819 and Thomas bapt 1824 are living in the household of William and Anne Willis in their 70s so i am assuming grandparents.Lydia was married by then.
Ann Horton (Willis) married again to
George Washbrook shoemaker wid marry Ann Horton 12-6-1838, witness Jonathan Temple.(from OFHS ) They moved to Birmingham.
The Temple family were living in Oxford for the 1841 census, and probably 1838 and one of their sons Newlands was born then in Oxford,then they were in York by the 1851 census.
.
Lydia Horton m Thomas Matthews Mary Horton m Jonathan Temple
1839 St Michaels Oxford 1834 St Cuthberts York
Elizabeth Lydia Matthews dau married Alfred Charles Temple son
MaryTemple (Horton) died 1-7-1878 age 64 which puts her birth 1814ish. I have a copy of a rememberence card from family documents kept. It was also suggested from the OFSH that there is a good probability that Mary was a daughter of William and Ann Horton as he suggested from the info he gave me that they spent a significant time away from Oxford and it was unusual that they waited until 1817 to have first child Lydia. There is also a death for a William Horton 1838 age 25 St Ebbe Oxford which could be the missing son William if there was one. but no Birth for Mary or William in Oxford.
I know quite a bit of this is speculation with out proof, but a lot sort of fits with the Horton-Temples, considering Jonathan Temple was a witness to Ann Hortons second marriage,and by then he was married to Mary Horton. I suppose i have confused you more, i just about confused myself.