Property inheritance

I please need your advice and directions to my situation. I am third in a family of 2 brothers and 2 sisters. We (my father) have a 2 storey house and an apartment. My father expired 4 years ago. My siblings are all married. My brother has a son and a daughter. I too have a son and a daughter. Right from my marriage my sister in law me and especially my wife were treated badly in our house. My sister in law was the person who always used to do negative propaganda against my wife and her parents. She is so clever that all (especially my mother and my sisters) started to belive and developed negative attitude against her. But I have studied till doctorate and can think rationally. I always observed and even evaluated that my wife was always targetted even though she tried to do her best to bring the family together. After 3 years of our marriage, I got a job in states and went there. I did not plan on settling and still plan to return back to India. I am a very kind hearted person who always extended a helping hand to others. However I am not rich by any means. I strived hard to take loan to travel to states. I did not ask even a single rupee from my parents since I came to united states. On the top of it I contributed generously to many occasions when asked. In usa, since I am in a university job, my salary is just sufficient to lead a comfortable life, and not amass money. I expected that I will get share from my parental properties. But due to my modesty, I never wanted to bring up this topic at all, as I always felt that if I do so, then they may think bad about me. But the opposite happened, my sister in law and my brother started conspiring and including my mother and sisters, they became a group and started to indirectly alienate us and my sisters parents from all our relations. My brother and sister in law took control of bank account and lockers with gold (mothers) and they would not let my wife to be joint owner of the account. Since when we left to states, they tried to do all sorts of things like breaking open our closet and removing documents. My father who was also a good person, with foresight bought another house with my monetary help (I gave 30% of the purchase cost), but for some reason since I am in usa, he registered the house on his and my mother's name. I did not complain as I thought it was not a problem. Now my brother hid those house papers too. The problem is that my mother and my sisters and brother all, try to behave arrogantly with me and my wife. When ever we go to India on an occasion, they would treat us badly and suspiciously. But they would never come out with their intentions. Sometimes I feel that they are awaiting me to come out with a statement that I want to separate. Sometimes I feel that they are trying to lobby my mother to snatch away the whole property. When I discuss with my mother, my mother too started to act cleverly and would not tell me her actual intentions, but on the other hand always was trying to malign my wife and her family. They are torturing us mentally. They would do things in unpredictable ways and finally somehow try to bring up a blame on my wife. I was not understanding why all this was happening. I have been asking my wife, if she needs to correct any of her mistakes/behaviour. But after a lot of thought and introspection and review of history, it appeared to me clearly, that they have single thing in their mind, to take away property and try to extract further money from me. They are all jealous that I am in usa and that I am making lot of money,when in fact I am not. As I explained, even though I am in usa, I am infact making less then what they are. I too have kids who's future needs to be secured. I cannot ask my mother or brother about splittng property as they are ready to storm on me with all relatives (who they turned on their side). I could argue with them about the correct share, but I know it is going to be a foul play, as people who don't adhere to rationality and dharma or correctness, would never come up to correct agreements. I am sure I will be overwhelmed with their shouting and bullying s. I wanted to know if I can get protection legally, such that they be warned and not allowed to make any bad moves. Is there a way I can get security from the wrong things happening? What should I do? I have not provided any identifiable information as I think it is not essential for explaining the situation and also to avoid misuse. Thank you very much