Sims 4 Story Progression Question?

Hello,
New to the game. I started a generation challenge, just birthed the 3rd generation...it's triplets!!! It's 3 girls!!!

When they are old enough, I want to move out 2 of the triplets and only play with 1 of the daughters. Will the 2 that I move out have story progression? Will they be able to find relationships and have families? (I would like that without having to jump households.)

I do not have any mods. Would consider adding one for story progression.