My father was ex- army person. He had 4 acres of d-patta land and he purchased 6 acres.He was expired 11 years back.I and my sister distributed 3 acres each 10 years back.4 acres d-patta land is changed to my mother. Is my sister have any right in this 4 acres d-patta land also? Please, guide me in a right way with out any legal and also any other issues.