Can i get my grandfather property

This property do not fall under ancestral property category.

Moreoever there is no concept of 'ancestral proeprty ' in Muslim religion.

The property inherited by your father and his sister was sold as inheritors upon their father's death, hence you cannot claim any share in it as a right. 

Don't be under misguidance for any reason.

Unlike Hindu law, which recognizes a "birthright" in ancestral property through the concept of a coparcenary, Muslim law does not grant any birthright to property ownership. 

Under Muslim law, a person's property is their absolute property during their lifetime, and no rights accrue to legal heirs until the person's death. Upon death, the property vests immediately in the legal heirs, who are entitled to specific shares according to the principles of the Quran and Sunna, not based on any pre-existing ancestral rights

As per Muslim law, you have no right over the property of your grandfather.

Admittedly your father had sold the property. At that time you had no rights vested in the said property.

As such, you have no claim over the said property.

Well advised by learned senior experts.

Besides the above, I do not find any strength in your claim over inam property, where you / your ancestres have no right, interest, title or claim even if the the act is abolished.