My grandfather and grandmother have been married for 45 years and had no children together. This means we have grandfathers side of the family and grandmothers side of the family (from previous marriages). I'm on the grandmother's side of the family.
My grandfathers side of the family has taken him and won't let us speak to him. They say they have power of attorney (as if that gives them legal right to forcibly remove him from the house). We spoke to my grandfather the day before he left and he adamantly said that he did not want to leave. His side of the family told us that they were just taking him for a few days but now won't let us nor his wife have any contact with him nor do we know where they took him.
Is this legal? What should we do?