First clarify with your sister whether she wish to continue marriage or not. Please be informed that just filing of Divorce, it cannot be granted. He never get it. You just file counter cases for separate possession, maintenance, dowry harassment and RCR. Nothing wrong to file counter cases. The procedure for each case is as follows:
Supreme Court sets alimony benchmark: 25% of ex-husband’s net salary
The Supreme Court has set a benchmark for maintenance to be paid by a husband to his estranged wife, stating that 25% of his net salary might constitute a "just and proper" amount as alimony.
A bench of Justices R Banumathi and M M Santanagoudar made the observation while directing a resident of West Bengal's Hoogly, earning Rs 95,527 a month, to set aside Rs 20,000 as maintenance for his former wife and their son, turning down the man's plea that the amount was excessive. The court said the amount of maintenance or permanent alimony must be sufficient to ensure that a woman lived with dignity after separating from her husband.
MAINTENANCE AND CUSTODY
THE LEGAL rules relating to the maintenance and custody of children
are found in the personal laws (including statutory) of the various religious
communities, and in the Criminal Procedure Code. There is, therefore,
no uniformity in this matter except to the limited extent to which the
provisions of the Criminal Procedure Code apply. We shall first deal
with the latter and then proceed to examine the personal laws of the
different religious communities.
Section 20 in The Protection of Women from Domestic Violence Act, 2005
20. Monetary reliefs.—
(1) While disposing of an application under sub-section (1) of section 12, the Magistrate may direct the respondent to pay monetary relief to meet the expenses incurred and losses suffered by the aggrieved person and any child of the aggrieved person as a result of the domestic violence and such relief may include but is not limited to—
(a) the loss of earnings;
(b) the medical expenses;
(c) the loss caused due to the destruction, damage or removal of any property from the control of the aggrieved person; and
Section 498A in The Indian Penal Code
376 [498A. Husband or relative of husband of a woman subjecting her to cruelty.—Whoever, being the husband or the relative of the husband of a woman, subjects such woman to cruelty shall be punished with imprisonment for a term which may extend to three years and shall also be liable to fine. Explanation.—For the purpose of this section, “cruelty” means—
(a) any wilful conduct which is of such a nature as is likely to drive the woman to commit suicide or to cause grave injury or danger to life, limb or health (whether mental or physical) of the woman; or
(b) harassment of the woman where such harassment is with a view to coercing her or any person related to her to meet any unlawful demand for any property or valuable security or is on account of failure by her or any person related to her to meet such demand.]