It's true that you lead a different life as a migrant. There are cons for sure and childcare is a big one. The problem with your anecdote is that you can't know

It's true that you lead a different life as a migrant. There are cons for sure and childcare is a big one. The problem with your anecdote is that you can't know your life otherwise - you may not have been happy or formed those social connections or been able to buy a place even if you'd stayed, just because your sister did those things. For all you know people would just talk about her weird brother who never goes out. I grew up in one of the least affordable places in the UK and if I had stayed near my parents then I'm not sure we'd have had kids at all, and I know the kind of housing we'd have and owning that sooner doesn't appeal.