In my main save I gave summer and travis a daughter in CAS, but didn't play them until travis had died and summer about to die. Liberty moved away with her daughter whose father travis was also genetically. I couldn't set it up in CAS so it doesn't show in family tree (well it was a long time back when I didn't know how to stop culling, so wouldn't be there anyway).
I'm currently playing the daughter of summer and travis, Ladybird. She got married and has two girls. She's in the athlete career. They still live in the BFF house. I've added a pool & patio etc. and set all the lighting pink. The older daughter wants to start a clothing retail so the whole family is saving up funds for it.
I also play Liberty's grandchildren who live across the road (weird timeline here now that you mention). Actually only Shandor lives there now, because his siblings moved away, Violca with Ted & Eliza's son and Lala to Newcrest. Liberty's daughter, Andromeda, was a writer (she wrote a popular series of werevolves) and there are still her fans in the neighbourhood. She shows up as a ghost sometimes.