I'd extrapolate the line: twins -> singletons -> immigrants. Not only they don't have their emotional pair support, they also lost all their friends. But, of

I'd extrapolate the line: twins -> singletons -> immigrants. Not only they don't have their emotional pair support, they also lost all their friends. But, of course, there's a huge filter. People who wouldn't be able to stand that don't become immigrants in the first place.