Dear lawyers... Problems with father

Firstly your grandfather's property that he inherited as his rightful share is not an ancestral property.

Secondly he cannot sell your mother's property on his own after the death of your mother, you are having a right over that property.

You can claim half of the sale consideration amount or any other immovable property as compensation towards your share or you can approch court with a suit for partition and for separate possession of your share in it

He has a share in ancestral property with all other siblings.

Similary you (with other siblings) have a share in your father's share, seek partition, possession and permanent injunction for your share through a local prudent lawyer.

First you have to file suit for partition by metes and bounds and after can sell it.

Whatever your father inherited from his father (your grandfather) is his property until his death. He can dispose it of in whatever manner  he likes. You have no claim on them when your father is alive. If he does not use it for your benefit, that is just unfortunate. He can sell his ancestral property. When he is alive it is not "our" ancestral property.

How could he sell mother's property.  please enaborate.