1) well if your husband files for divorce in India refuse to grant him divorce
2) contested divorce cases take around 5 years to be disposed of
3) further your husband will have to prove all allegations in petition to obtain divorce
4) you can lodge 498A / domestic violence case against husband , MI L and SiL in India for continuous acts of cruelty
5) in USA you should have lodged police complaint against them for criminal intimidation if they had harassed you .