Whether remaining sons have right over gifted property

we are four brothers and we want partition of the properties which we had from the our late parents.third one of us going to reach court for partition among us. till now there are several issues happened on these properties. major thing is fourth one of us had a house through gift deed from our late mother when she is alive. my mother had it through settlement from my father and my father had it through partition of my grandfathers property after his death . now the question is whether the remaining sons have rights on that gifted property. also my mother is cared by third one of us for five yrs when she was on cot. my mother passed out on2015.now the third one is asking two shares as he cared our mother . is it law.please clarify for my two questions, will the third one get two shares and does we have right on gifted property to my brother .we are HINDU