can my mother deny my right to claim ancestral property

ancestral property is which you inherit from your fathers side and not from your mothers side.so its not ansestral property in nature.your mother and her sisters would have relinguished their right in favour of your brother and they would have registered the same.

another thing is even if a woman gets her share from her fathers side whether ansestral or self aquired is considered to be her self aquired property and she can will it to anyone

you cant lay any claim in the property

Sir- does your mother gave it as a will or a gift deed when she transferred it to her brother... i guess that matters to an extent in a HUF .