Childern live with adults that aren't related to them

[Sire26]

I know this is weird sounding but can kids live with other adults that aren't related to them? I'm just wondering because I wanna do a story like thing in Sims 4 that involves an adult finding a child let them live with them. Does the adult have to be married to another adult to live with the child? Or can they live with the child as just like roommates? That's all I'm asking. I'm not trying to sound weird, I'm just asking. Please inform me whoever responds to this topic. Thank you. 

[Dellena]

The child doesn't have to be related nor does the adult have to be married.  I run an orphanage game a lot with this situation.

[Playalot]

Welcome to the forum Sire26. I've even had game generated families of unrelated children and teen and young adult so basically you can pretty much do anything you want. 

[meubanks]

If you start from CAS, you can even start a household with no adults. I've made "runaway teen" households before. When using transfer Sims in game, there must be at least one YA or up in a household, but relation is completely irrelevant. I'll sometimes split large households just to make them manageable if I'm playing rotationally.