cant invite sims to stay over

hi! ive been looking all over internet for answers and found nothing. my sims family invited themselves over to my house to help me care for my newborn. my sister aged up to a toddler while staying at my house. i went into cas on my sister and edited all of her outfits now that she aged up. i went back into game, it had me playing as my family instead of me, i go to manage worlds to go back and play as my sim with the newborn, and then my family says their goodbyes and leaves my house even tho they were supposed to be staying for 4 days. (they left 2 hours into the stayover after i CAS my sister) now i tried to invite them all back and its showing nobody in my family to invite other than my toddler sister instead of my sister, mom, and dad. its not a mod issue bc ive already tried seeing what would conflict. its very frustrating because i already made rooms for everyone and wanted the stay over to happen. i even tried going back to old saves and no luck. HELP?!