Wm Boyne m Sarah Cain Braddan 18331217 - child Wm Byne bapt Douglas St matthews 18350531 - Sarah buried Bra 18360826 age 25 which suggests sarah was dau of Wm Cain + Cath Comish bapt DSM 18081118 (9th + last? child)

Wm then married Margt Clague Braddan 18381119 - she + stepchild Wm can be found (without her husband) in a shared house (head of other part Wm Fell painter) on North Quay in 1841 census (Margt age 25)

Wm junr is I think with Jane + Michael Byne in Douglas in 1851 census