ok, I think I found William and Jane in Sledmere.
Children:
1) Mary Hope (1821-) (m:John Rudd 1840?) (d:1890:Bridlington)
2) William (1823-?)
3) Thomas (1826-1913 Port Perry, Canada) (1841: Driffield, Nafferton, Alice JEFFERSON household as male labourer)
4) Elizabeth (1827-1864?) (1841-1851: Driffield: Thomas JEFFERSON household as female servant)
5) Richard (1832-1833 burial: Sledmere, Yorkshire)
Does anyone have a findmypast account to confirm parentage for these children? FamilySearch shows a Thomas and Jane living in Sledmere at the same time as William and Jane.)