Legal Question in Family Law in India

you have two remedies. One Civil - He is simply a licencee staying in your house without licence fee and out of love and affection, a son normally would have from parents. Before that you have to give him a notice asking him to leave or else pay a licence fee of market rent.

Second - Criminal. File a police complaint giving details of his threat be it may to your wife or to younger son and his attitude towards the family, about the breach of peace and tranquillity of the family. You may also file a writ petition seeking directions to the police to take strict action against him and to let you live peacefully at the age of aches and pains. Alternatively, your wife may write to National Commission for Women. Or let your wife file a criminal complaint to the Protection Officer under Protection of Women from Domestic Violence - in particular Right of Residence and restraining his entry into her (wife) residence. Your wife is entitled to free legal aid from the state.

I do agree with Above answer.