This is a nice little diorama, but it doesn't even come close to the hygienic practices of the common folk until about a hundred years ago (Romans might be excluded)
Imagine a family of eight al sharing the same bathing water in the same bathtub. First the father steps in, then mother, and afterwards all the children from eldest to youngest take their turn. It might have sucked to be the youngest and finding a half-empty tub full of cold, grimy water for you to clean yourself in