Rule for gift

Sir My name Malleswara Rao My father having two childrens one son and one daughter. daughter got married in 1991 and she wad died on 1999 july for family problems. she is having two childrenss one daughter and one sonr. they are majors now. My father is retired govt employee and he is self acquired property one house in eluru (West Godavari District). Now he is live. This property given me through gift deed with registration in 2008. He is taken loan and he is contructed house. that documents and no objection certificate we are having. Now my sister husband or childrens can claim this property. please tell me.