What to do when in-laws are going to file false case

Hi There, I'm indian male from uttar pradesh, married on Nov -2017, working in gurgaon. My wife is a teacher in her hometown, teaching in a govt school on adhoc basis. Situation - 1. After my marriage, she used to come to my home whenever i go to my hometown on weekends and she leaves on monday (within 2 days) because of lack of holidays in her school. 2. whenever she used to come in my home, she lived like a modern girl (there was no restriction at all on her in terms of cloths, food, household chors, outing with me and many more). 2. We daily/often used to communicate on phone/whatapp/whatapp video on almost everyday in the morning and evening. 3. I've given her money many times though online transation and most of the time in cash. 4. She always quarrel with me like hell on every call, even while going to office. 5. She usually feel unconscious due to low BP issue even before marriage. (Her BP goes down to 60). 6. She always complain to her parents that I do not talk to her and not receive her call. (She always lie) 7. She got pragenent on end of April 2018. 8. Her parents made her aborted illegally (There is no doctor's consulation and we (I and my family) were unaware of it) on mid of May 2018. 9. On end of June, My parents went to her home to bring her. But she refused to come. And she quarrelled with my parents and her parents were supporting her. 10. After this incident, We are not talking to each other. I've blocked her number. 11. We never ask anything from her or her family neighter before nor after marriage. Problem - 1. After the incidence of abortion and battle with my parents, we are not talking to each other and I'v blocked her. 2. Today (16 Sep), her parents alongs with other relatives came to my home and giving threat to my family, That they will spoil my family Question - I don't know what step they will take. Please advice me how to deal with the situation? if I anything goes legal, how to prepare myself and my family? Please do advice. Thanks,