I would move. Me, DH, DD and DS moved interstate away from all family over 12 months ago and even though it was hard I think it has been really good for us. We also moved because of work for DH. DD was 2 and DS was only 5 months. My kids adjusted really good. We Skype all the time with my mum and sisters and also talk on the phone. If your only 4 hours away your family can always visit on weekends.