My uncle is facing Schizophrenia, but has made very dispute in family as he is missing now

My Father's brother i.e. my uncle is facing Schizophrenia, a mental illness in which a patient feels someone is trying to harm him. In our case, my uncle feels that his family of 4 in which his wife and daughter are trying to harm him. We are different families living apart. we had no idea what his illness is and my uncle conveyed very smartly by giving some proofs and pieces of evidence of how his wife is trying to harm him. Though we were skeptical about him what he is trying to say may not be true we consulted twice him in the Mental hospital. Doctors say he needs rest so we moved him to my Father's sister's house so that he can feel safe. My uncle is a teacher by profession, he was attacked in his school by his wife's family and they were forcing him to go with him but somehow school staff and my relatives managed to resist them. Though we kept convincing him, he should go back to his family they are not trying to harm you but he didn't listen instead he threatens us that if we do so return him to his family he will be no more. One day we were convincing him we should visit the hospital once again , he kept denying and one he left the house alone and he is missing now. We have filed a missing case 6 days ago and he is missing since 8 days ago. We put his bank accounts on hold so that he can not withdraw any amount. Though helping this a lot but now we are in trouble as his wife's family is threatening us that we are responsible for this !!!! they are threatening us they will call us in court !!! we tried to help him very honestly but we are the ones facing trouble!!! He is still just reading our WhatsApp messages but not responding my question is that if he didn't return home are we legally in a problem??