When dinner was over, Sherlock made William help him clean the table (since John had cooked). Afterwards, it was time for a bath.

As much as William tried to me mature, and he tended to be for his age, he was still 7, and he loved baths. Sherlock and /or John usually took their shirts off (because he tended to splash) and stayed with him while he played, and then at the end washed him and his hair.

Sherlock always loved these times when they did normal family things together. They weren't a Vampire and a Demon and a mixed child, they were just a normal(ish) family.