Property and wealth issue

My Husband and myself helped my sister in law to get married to a US Citizen...my father in law was against but we convinced him....now my father in law is no more and have died without a will...when he died my sister in law was just married according to hindu style (yeah but have not registered in India) marriage is registered in US... and she realised that her father has lots of money so she can have all of them so gradually slowly she is brainstorming my mother in law and saying that even i want to keep some wealth in india and my mother in law is like behind her daughter, she has alsmost forgotten her son....she hardly talks to my husband and for 2 to 3 hrs she talks to her daughter she has transfered more than half of the amount to her daughter and she has tried her best to give some of our amount also to her .....imagine which son and daughter in law will like this...i dont understand is she(sister in law) is going to come when my mother in law will be bed ridden....and moreover her husband is not working why she needs so much of money...infact we have put up a case also in high court against both of them....can anyone tell me can i file a complain against her so that her GC process should be stop as its been two yrs she is married i am not much aware of US laws.....pls help or advice