dv act

It is possible, when the sister(s):

a.     harms or injures or endangers the health, safety, life, limb or well‑being, whether mental or physical, of the aggrieved person or tends to do so and includes causing physical abuse, s*xual abuse, verbal and emotional abuse and economic abuse; or

b.    harasses, harms, injures or endangers the aggrieved person with a view to coerce her or any other person related to her to meet any unlawful demand for any dowry or other property or valuable security; or

c.     has the effect of threatening the aggrieved person or any person related to her by any conduct mentioned in clause (a) or clause (b); or

d.    otherwise injures or causes harm, whether physical or mental, to the aggrieved person.

Even if the sister is married, she can be held liable under the Act.

Also Read: the case of HARSORA v. HARSORA.