The property left behind by your deceased grandfather shall devolve equally on all his legal heirs, if he is reported to have died intestate.
Thus since your deceased father was one of the legal heirs, he was entitled to a legitimate share in that property s a right.
Now upon intestate death of your father, his share of property shall again devolve on his own legal heirs consisting his wife, children and mother (if living).
Therefore you can seek partition and separate possession of the share of your deceased father from your paternal uncles.
If they refuse to accede to your demand then you can file a partition suit and seek separate possession of a share of your deceased father.