What legal option after a decree relating to property in one's favor?

We would request you to properly explain what do you mean by a degree. Does your degree implies decree? In case it implies decree we would request you provide the details of case, in which the same was passed.

Further a pre-requisite condition required for a property to be Ancestral property is that it should be owned by the great grand father followed by grand father, father & present generation all in this linear generation living & enjoying the property. The property should not have ever partitioned & share in it distributed to any of the Hindu Coparceners as in any linear generation as mentioned above, in other words, it should be intact single property which is being used jointly by all members of the Hindu Joint family. Therefore, all property inherited by a male Hindu from his father, fathers father, or fathers fathers father, is ancestral property.

The essential feature of inheritance of ancestral property according to the Mitakshara law under Hindu Succession Act is that man inherits from any of his three immediate paternal ancestors, namely his father, father's father and father's father's father is a ancestral property as regards his male issue, and his son acquires jointly with him an interest in it by birth. Their rights attach to it at the moment of their birth. Also, under the Hindu Succession Act the sons, along with other intestate heirs indicated in Class I of the Schedule.

Therefore, if your land falls within such ambit then you are entitled for the share in your Grandfather’s property. Furthermore, in view of above mentioned, the basic proposition is that the grandson acquires a right in the property of his grandfather at his birth and has a right of inheritance jointly with his father at the time of succession. 

Hence you will be entitled for the share in the land and that your uncle cannot claim to hold the property as absolute owner nor can he deal with the property as he likes.

In view of the aforesaid, you can at anytime seek a partition of your and father’s share. A partition of the joint Hindu family can be effected by various modes, viz., by a family settlement, by a registered instrument of partition, by oral arrangement by the parties, or by a decree of the Court. When a suit for partition is filed in a Court, a preliminary decree is passed determining shares of the members of the family. 

The final decree follows, thereafter, allotting specific properties and directing the partition of the immovable properties by metes and bounds. Unless and until the final decree is passed and the allottees of the shares are put in possession of the respective property, the partition is not complete. The preliminary decree which determines shares does not bring about the final partition.