I'm not surprised he wants his family back (Yes, even W & K). I'd wager that he misses all of them and his old life but also loves his new family and wants them to be happy.
I agree with this, @SighsTheNewWord and with @bakalava that he probably feels like a fish out of water in LA and misses his family and old friends. I also moved to the US for my American DH’s sake and it’s bloomin’ difficult to settle in, even as an ordinary person. It took me several years.
One of the saddest realities with M&H is that they’re both from dysfunctional families and don’t know much about healthy relationships. I’d argue that her background is more dysfunctional than his, as her family was rife with estrangements. So neither of them can advise each other on how to maintain good relationships- she has no experience of healthy sibling bonds, for example.
I hope they manage to find happiness on LA, but I think Harry is really going to regret all this laundry-airing.