Sister in law giving suicide threats on demands not fulfilled

Dear sir , Mere bhai ki shadi 1yr pehle huwi thi shadi k bad bhabi kuch din thik tho phir unke demand badhte jate has choti choti baat par ghar chor k chal jati h and sucide ka dhamki deti or 2-4 attemp v kar chuki h .avi v 23day se apne pihar mai h.unke ghar wale unko samjhate nai h . Unki badi behan ki v 2 shadi huwi or 2nd shadi mai wo mitti oil daal kar sucide kar li choti si baat par. Meri bhabi ka v gussa bahut hai hume Kia karna chahiye jisse koi crime n.a. ho sab thik rahe.