As i see it, Joseph Twigg b 1882, Whitehaven mmn Sloan.
William was married twice and the older children are from his first marriage.
He married Mary Sarah Sloane in 1873.
The family emigrated to S A before 1891 so Joseph is not on an English census.
Some of the children remained though and are in 1891 census with a Kilbride family, if i recall.
In 1901 - good find- he has some of his SA born children with him.
Thanks. William's first wife was Jane Snowden.
I think Mary Gambles is Mary's mother (so William is staying with his mother in law whilst visiting from SA).