Laws for married women to protect their parents

My question is - as per several laws boy's are bound by law to protect their parents. But, if an women, who is a housewife wants to take care of her ailing parents and mentally challenged sister, does she receive any legal support; esp. if this is done against the wishes of her husband - who is instigated by his elder brother and his wife, who bears heinous intentions against the daughter of the house along with an eye upon property of the ailing parents. Can the women challenge them in the court of law, and produce legal orders instructing them to check their moves. Can she produce legal orders, instructing the husband to allow the ailing parents to remain in his house, where the ailing parents meet their own expenses from the earnings received from their property. Can she take a separation order from court, and receive a fair share of her husband's earnings as maintenance. Can she, for that matter file for an RTI claiming to know the details of her husband's earnings. Is there any law, by which she can protect her daughter from these evil intentions of her in-laws, or does she have to wait till CRIME IS Committed The marriage is registered under the Hindu Marriage Act