Mu current guess is that John Simpson YARWOOD could be Violet's father. On the 1911 census, the details about the length of the current marriage and details about the children births/deaths should have been written against the mother's name. As happened quite often, it was originally written against the father's name then crossed out and re-written below. The number of children is different.

In both cases the number of children born alive is 6, and the number who have died is 1 (that would be Kitty who died 1909). But for the number of children still alive against John YARWOOD's name he has originally written 5, then crossed it out and put 4, then crossed out the whole line. Against Sarah's name it just says 4 children (of that marriage) still alive and 1 dead. Which doesn't add up to 6 born alive! So either they couldn't count, or possibly the missing child is Violet! A bit of a stretch of the imagination, but you never know.