I’m in nothing like a stable enough situation to take on a kid, especially at short notice. Fortunately though, I can’t see any non-apocalypse like situations where I’d be asked to do so.
The only friend who’s even possibly close enough, who has a child had her in a poly relationship- the kid has 3 parents and two step parents, who live in three differnt cities.
I certainly wouldn’t rush into it anyway, my parents were actually faced with a similar dilemma when I was 21; my mother’s half sister killed herself, and her husband had a mental breakdown. They had two boys, age about 4 and 8. The 8 year old was already seriously disturbed, and had made multiple attempts on his little brother’s life (leading to hospitalisation at least once).
My mother didn’t really know her half sister, but I know my parents were seriously discussing offering to take on the younger boy, as he had no other family in a situation to do so. Eventually though, they decided that both kids really needed more care and attention- given how messed up they were- than my parents would be able to give. They both went into foster care, and you know what? It was the best thing for them.
They both got brilliant foster parents (they were seperated, for fairly obvious reasons), who were stable, and great at dealing with difficult kids. The older boy was the only genuinely scary 4 year old I’ve ever met, now he’s just a little odd as a 19 year old . The younger one is reckoned to be unusually sensible and responsible, for a 15 year old boy. They’re far closer to each other now than they ever were as kids, and they’re also pretty close to their Dad, who did not attempt to regain custody, seeing as he’d always worked on the oil rigs, months away at a time, so he’d never been exactly in normal custody of them. He kept in touch, they stayed with him somtimes, but he wasn’t the best person to have them full time.
I know there can be major issues with foster care, but sometimes it really does work out well. It’s not a horror to be avoided at all costs.