Can reopen oral partition if not equally shared

We are Hindu family of 4 brothers, in 1980 there was oral partition beween us. In that 0.5 acre was assigned to me, 1.75 acre was to brother-1, 1.5 acres was to brother-2 and 0.8 acre was given to brother-3.  Now everyone else sold their shares to third parties.

After selling their shares, they are asking for land from my share. In this case, can I legally reopen partition because partition which happened in 1980 was not fair and balance and ask for equal shares ?