i was looking for somewhere to post a suggestion so here it goes.
my own suggestion would be family rooms (private room upgrade)
as it currently stands each new slave you obtain through intimacy shows in their relatives tab who their mother, father, brother(s)/sister(s), and children are but options for housing them are community room, private room, jail, or your bed. my suggestion is to add an upgrade option to private rooms that allows them to hold 2-5 slaves given they are related (parents, grandparents, and children).
maybe this could be a way to reduce stress and lust or build obedience and loyalty if family members stay within the same room as opposed to splitting them up.