I am keeping my fingers crossed and saying some prayers that the man will change his mind and move near his family. It doesn't make sense for him to live alone in a home away from his family unless they do not want him around them. If it's a matter of keeping the place in the family, then rent it out to someone and have their father move closer, but the best option would be to sell it and relocate their father. Doesn't make any sense to me why they would be discouraging him to stay there.
Sit quietly, the answers will reveal themselves when you least expect them to. The past is gone, the present is a gift and you need to focus on today, allow the future to reveal itself when it is ready.
