General Power of Attorney and Agreement to Sale and Purchase

5 years ago

I have purchased a flat in Uttam Nagar Delhi in July 2013. The owner executed a notarised irrevokable General Power of Attorney and signed the Agreement to Sale and Purchase having a stamp duty of rs 50 on GPA and Rs 10 on Sale Agreement without going to sub registrar office since she was my relative I had not pressurised her to appear in front of sub registrar. Then in 2015 when I confronted her and told her that i want to sell the property and asked her for appearing in subregistrar office , she refused. After that my lawyer suggested me to sell the property without any fear. Then in 2015, I have registered the flat in the name of third party (my wife and my sister jointly) at subregistrar office. Then the third party rented the said flat for almost 1.5 years. Recently(in july 2018) what we have found is that the owner has locked our flat with their own lock over my lock. And when we have lodged a police compaint the owner is refusing to give us the possesion back and is saying that she has not executed any gpa in her wits since she is uneducated and saying that she has not signed knowingly.
Now I want to know that how to get back the possession.