Prayer Requests - Bring our son back to us

Please bring our son back into our lives. Something evil has taken us away from him. We haven’t seen him or our grandchildren in over a year. He is very bitter towards us when he has spoken to us on the phone. I think his wife does not want him in our lives. He once was very close to us. Please God, I beg of you. I want a good relationship with my son and his children. Please help.