I think the logistics is all off for them to move to the UK. Firstly, visas. Its extremely unlikely he'd get sponsored by a UK company to work so then it would need to be a spouse visa but she'd need to show she earns £18,500 in the UK, which she doesn't. Or have something ridiculous like £60k in savings but they'd have to sell their house in the US to have that. The visa process is also extremely long, over 6 months plus so I just can't see how it would happen any time soon. Also, why does he never go to the UK with her? I wonder what his parents think of Caroline. Basically telling them I'm moving back and if he wants to come, he can. If not, I'm still moving back.