helpless daughters

hi, iam a married woman age 36. ihave one sister age 38. ilost my mother just after only 2 days i was born. at that time i had my grand mother ,grand father, aunty(dads sister) uncle. we are not rich . my father lost their job. and then he had some bad habits.my aunty and uncle dont getting marriage because me and my sister. they ruined their  whole life till today for both of us. bagging from the people we both studdied. getting married. iamm a house wife and my sister is a pharmasist. afte we got married they started financial problems . my sister has one daughter age only 2 yrs. my sister give some about her earning th em but her husband dont like it .againts it my aunty age 58 spend aii the time to grow her child. then also her husband start fighting always blaim her and our aunty uncle. my uncle work with my husband age 60 far almost 12 to 13hours.  so tell me now what is there no law for us who dont have any support (no brother) or any one else in family to feed  the them. they spend whole life for us and whenits our time to protect them we are helpless because weare married to other people. in laws dont like it so where all the daughters go who dont have other option? let our parents die without eating? there must be some law that after getting married daughter should have right to feed their parents with  her salary because son have right to do this daughter_in_law forced to do this  so why daughters dont have this right? i want answer from all the daughters who have a same problem that i face.