I'm having trouble finding Ann E King and family on 1891
William and John King are clearly brothers. William vanishes on censuses for me until 1921, when suddenly he's back, living in the same street as other family members. Listed as single, but that might be an error as he's a boarder. If John King adopted Ann, in a manner, she would be a sort of step sister to the Wareham and King children of Mary Stock. She then married the former brother in law of her step mother