Wether partition done through panchayat valid or not?

In father family including him he have four brother and two sister total agricultural land is 10 acre partition was done in panchayat before 20 years but none of properties been registration in 10 acer there was 4acer in one village and 6 acer in other village and my dad is staying in mumbai my father last brother got total 7 acer land, the 4acer land all got equal share but in 6acer land my father small brother occupied all land just providing that he have only 2brothes and done name transfer in 6acer no registration just khata transfer is done. I want know is panchayat partition is valid