Will it still be ancestral property or self acquired?

Note; These querries are from grandson of A. B is his great grand father.

Once a property has devolved upon either the beneficiaries or the legal heirs through a process of law then it becomes the sole and absolute property of that person. It cannot be called ancestral property for eternity. The ancestral nature gets extinguished. Here the grandsons have no right in the property as the ancestral nature is extinguished but the property now in the hands of A becomes ancestral for his legal heirs if A dies without leaving any will.    

Thanks Mr. Rangnathan,

Though all this property is being transferred ancestrally by their fore fathers. It looks very strange that how simple formal procedure of change of ownerhip can create or become a tool of injustice.

But now another question of law arises that If the transfer was due to or by will than can any one transfer the whole of ancestral coparcenry property by will?  

Can this be disputed? Is there any limitation of time to challange this will? The child is still a minor of 4 years his ather died about 3 months back only. A case under IPC sec 498, 406, 506 etc is live in a civil court against in laws. At the same time the GF is saying that he alreaddy debarred his son 4 years back just before the case was registered against them. So as the father of the kid was debarred and so he has no right in the property. 

Best regards and Thanks very very much again for your valuable time.

Note; father died about 3 months back

Only the portion which is allotted to a person becomes the property of that person and that only can be transferred through due process of law i.e. either by will or conveyancing. A will can be questioned by the beneficiaries if it is not as per the legal requirements. 

I think I could not explain my queries perfectly. My question was: 

1. If great grand father did an illegal act while raising will in favour of his 5 sons way back in 1962. As for as I am aware of any Karta can only raise a will in favour of any beneficiery equal to his own share of ancestral coparcenry property? So the great grand father did a illegal act of issuing will of whole of ancestral property received by him from his own ancesters.

2. Can this be now challanged in the court or have become time barred already?

Thanks,