My 18 yr old nephew was checked into a rehab by his father about 60 days. He was told that this was a 30 day program just to get him there. His mother is wanting to go and get him out but the rehab people are telling her she can't do that unless the father and mother agree. This is in the state of texas and he is there willingly. He is in No trouble with the law whatsoever. Can they hold him against his will?/