Tenant Eviction.

My daughter and son in law had gone to USA in the year 2004 and unexpectedly got settled there.Hence I don't have any GPA registered on my name to take care of their property.They have asked me to give one of their flats in an apartment for rent . So I gave it for rent in the year 2006. Every year I have renewed the agreement for 9 years i.e. till 2014 .Later I have asked him to vacate as he pays very less rent which is for sure below set value ,but he is not vacating till now. And I suspect he has made forged agreements of 11 months to stay.Suddenly this month i.e. September 2019 he says "I won't pay any rent now on wards.You are not the owner. Lets settle this in the family court". How should I approach? --FIRST 1) After staying for these many years with expired agreement or may be with forged rental agreements what rights has he got on the property ? 2)Does he have any claim to the property ? --SECOND Should I wait and get the GPA on that flat and then file an eviction case? or Should I approach police showing the flat documents and file an eviction case ? or Should I go to a civil court ?