Property issue in familu

My father has 4 brothers out of which one of the brother has sold all his property to one younger brother.we have a common road which leads to a pond.the pond is also divided .we are two sisters live outside our state.we recently visited our hometown and were not allowed to do any fishing.when i talked with my father he said that what we did is wrong and that we should ask my fathers brother for fish.My uncle do fishing and sometimes sell them and we are not allowed to call any fisherman for fishing even after a year.Is this correct? Once my mother went tbrough t he narrow road to the pond to which my uncle abused her and later my sister built pillars for identifying the road boundaries.All the cost was beared by my sister though it was a common road.one of the pillars was broken by my uncle and his son.Though his act he always tries to intimidate us.My father always take their side and donot stay with us.he has veru good relation with his brother.what kind of steps should we take to overcome this issues. we have a very spoilt relation with this uncle as once he has beaten my mom and no one came for justice.even a fir was not registered and we were driven away from the police station.