Guardian sold minor assets 24 years ago

Hi Experts, We have a land of 4 acre in my village. This is our ancestral property and it is divided by my grandfather to his sons 4 persons where my father includes in that. During 1994 my father was in abroad and other 3 sons were available where my grandfather allocated 4 acres to fours sons but my father is not available. I was a minor 13 years old, so my mother was appointed as a guardian to my father share 1 acre. Later my mother sold 50 cents to my uncle in 1995 and havent get any approval from court. Since its agricultural land my uncle bought for his purpose. Now I have 2 questions. 1) As a legal heir,Without my father signature, how the land can be divided. is it valid as per hindu act. 2) Can i move to court to get the 50 cents which my mother sold to my uncle.