With regards to the self earned property; this kind of property would be treated as separate property. The woman is entitled to dispose the property by way of will or gift or a registered settlement deed, as she likes it.
Section 14 of the Hindu Succession Act states that, the property of a female Hindu is to be regarded as her absolute property: (1) Any property possessed by a female Hindu, whether acquired before or after the commencement of this Act, shall be held by her as full owner thereof and not as a limited owner. Accordingly, you are free to dispose off your share of ancestral property and your separate property in the manner as you like.
Section 15 of the Hindu Succession ct provides that when a female Hindu dies intestate, the property shall devolve according to the rules set out under Section 16 of the Act. It states that when a female Hindu dies intestate, and in the absence of a son or daughter, the property would devolve on the heirs of the father of the woman.
Coming to the query related to the legal heirs of the ancestral property, the property of your parents would be equally divided among the 5 siblings (3 sisters, 1 deceased brother and you). Therefore each sibling would get 1/5th of the property belonging to your parents. Also, the share of your brother would be vested with his family (the boys and wife). You should consult an expert in this regard. You can call me at 09555 507 507 or send me a mail at email@example.com