Sorry - keep thinking of extra things to add that I had found out: Mary's brother Thomas (son of Jonah) married Elizabeth King in Turvey 1813, and a potential child Jonas bap to Thomas and Elizabeth in Carlton in 1819
To clarify: The two other siblings of Thomas 1752 I am sure of are Elizabeth and Israel as both parents clearly listed in their baptism records in Harrold as Thomas and Rebecca, just like Thomas's bap record shows as do Jonah's and Ann's. The other two are just possibles: Mary was made an apprentice in Harrold to William Hays, lacemaker in 1770, making her the right age to be a sibling. Robert is more tenuous, he was bap in Farndish 7 miles from Harrold in 1749, father is Thomas, no mother named.