If your son –in-law is living in New York for over two years, he may file for divorce in New York.
In order for your son- in- law to get a divorce from your daughter he will have to serve her with a summons and complaint.
There are no ex-parte divorces in New York. He will have to prove to the court that he made every effort to contact her and was unable to do so
Before the court will allow him to proceed with the divorce.
I cannot tell you whether India would recognize a New York divorce. You should consult in Indian attorney regarding that question.
Leonard M. Weiner, Esq. /Divorce Solutions