Idea - family
It would be very nice if you made a pack that allowed your sim to give their child up for adoption, leave their child at fire station, also teen-pregnancy would be more realistic, you could then choose when you got pregnant if you wanted to have an abortion, keep the child or give up for adoption, this would invite an entire system for sims qualifying to be foster parents & adoptive parents. Your sim could interview potential parents themselves or go through the agency, as well as choose closed and open adoption. It would be really fun gameplay, as the child grows up, the adoptive parents could choose to reveal that they are adopted.
We could then also have orphanages, you could run them and go there to meet and get to know children. There may be requirements to have a good income and enough space. Even adopting siblings.