If you say that it was ancestral property what prevented you from objecting settlement of compensation amount to your father alone.
You could have given an objection letter and sought your share in the compensation amount.
In my opinion you are thinking that your grandfather's property is ancestral property.
If so, then you have misconceived the provisions of law.
Your grandfather's properties are not ancestral property to you.
Your father shall be the absolute owner of the property and you cannot claim a share out of the compensation paid to him.
Especially at this juncture when your father is no more, any claim in this regard may not be maintainable