What support system does he have there? --Partner or children? If he's on his own, might he consider moving closer to you? --I was prime care-giver to my father from 1000 miles away. It badly affected both my career and my well-being in other ways. Dementia tends to do that to the prime care-giver, no matter the distance, but there are certain unique difficulties to trying to help someone when they're so far away.