My father Age is 65.Ownership of House is under my Father.He has given 50% house as a gift to his brother six years ago.Now his brother who is well income wants to construct house now .The financial conditions of my Father is not good now.He request him to construct house after a year.My father's brother is not ready and pressurising him to built early.He abuses him after drinking alcohol and threatened him also .What legal action can my father take?