Mother after death of step father, don't want to give me property.

I am the child from my mother's first wedlock. Thereafter my father expired and then my mother married my father's brother. From the second marriage there are 2 kids. Now my father's brother has also expired. Now mother does not wish to give me any property which came on her name after father's brother's death. The property belonged to father's brother. Can i claim any share in it?