property purchased from sale of ancestral property

You file suit for partition  and fight legally in court and take stay ,claim as ancestral property who knows what happens in court,try your best and effort.

In response to your query,

In the hands of a family member who has received a division or partition in a joint Hindu household, it becomes "self-acquired" property.

If your father's share of the ancestral property was partitioned between him and his family members, his share of the property handed to him at partition would be considered his self-acquired property. And I am afraid if he has sold that property to acquire money then you cannot claim any of it to be yours according to the Hindu Succession Act. If only your father is willing to give some of the share to you with his free will then you can claim your rights, and if your stepmother is trying to influence your father into not giving you any share then I would suggest you to take the matter to court against her and see the result.

Regards,

Aryan Raj