Other ideas/relationships that could be fun!
I hope it's all right to start another topic too haha I had a few other ideas come to mind but idk if they've been done yet in other expansions and I just haven't seen them yet!
Live in nanny - a nonplayable character. I find the nannies in the sims 4 are infuriating haha they only stick around for a day and for my single mother who has four kids I'm like, where are you going?? And why aren't you helping out more haha - so maybe a nanny that can stay and actually be of help instead of standing around right until the toddler ages up? They can go about their regular lives but they're mainly at the sim's residence! Maybe more male nannies too?
Sibling rivalry - The dynamic of the oldest child, middle child and baby of the family and all those social dynamics would be so cool! I feel like it would add more depth to siblings cause there's not much that goes on between them that's different from any other family relationship so it's kind of boring. Lol Plus if the parent had a favorite and the others knew that would be interesting as well!
Adopted kids - Maybe kids put up for adoption could reappear in the world with their adopted families and whether you choose the option of being able to interact with them or not would be interesting! They wouldn't show up in your family tree but you'd know it was them.
Sims that have a crush on someone but isn't reciprocated! Especially in teens but adults too. It's a bit boring that you can get anyone to fall in love with each other if you play the game the usual way.
Home schooling instead of the kids going to public school would be interesting as well! Maybe there's even an option to hire at home tutors?