My DD and DGS live with me. Moves should be underway for her to get her own place, but our move from overseas back to the UK when she was pregnant made it hard for her to live independently at the time.
At the moment, it works-ish. I'd like them to move out, but also know it'll be a sad day when they do, because I'll miss living with DGS. I have no desire to live with him once he's a teenager though! I'll also relish the clean and tidy house once they're gone.
There are a myriad of ways to be a family. As long as everyone involved loves the child, it's a family, regardless of relationships or even being related. The idea of the nuclear family is not universal and based on DGS's school, isn't even the majority.