Need Assistance regarding family property

I am 44 yrs old lady, we are two sisters . I dont have good terms with my parents. I am not expecting any good posibillities in terms of there help to me from there property, I mean will they give all the property to my younger sister. As this is my second marriage , I am raising my kids from first husband all alone, its just a compromise sort of . Can I expect any thing good in life. If my parents wont support me as they have 2 floors separately . I am the legal heir of atleast 1 floor, nothing else expected, but it will just help me as a fix deposit in my old age. Any thing I can do to stop such possibilities. pls suggest?. they are well to do as my mother is retired from a govt Job. Father is having FD from his job.I am having loans to pay. But they never ever asked if any help required. Even they know abt my second husband taking no responsibilities of me and my kids.