Father is forcing for regift home

Hello, My 78 years old father is too egoistic and bad-tempered. Recently his behaviour is very reckless. We are 2 sisters, our mother passes away 10 years back. Since then we are taking care of him. But with few small incidences our father gets agree and decide to stay alone at his place. We did support him for the same. 4 years back he denied to talk to us at all and without telling us he bought a car, later he got cheated with some stranger and he transfered that on that person's name. He also gave my mother's gold jewellery to that person. Later she refused to give is back.he was in trauma , we supported him in that phase and again tok care of him. He was staying at our place. This should not happen with hia hone so he decided to gift his hone go both of us, so he did the gift deed fir the same. Now from last 2-3 months he is again started started saying I want my hone back so you regift it. We know that his mental condition is not good and he may get cheated again. So we are refusing to do that. Are there any legal bindings on us to regift that house ?