Wife deserted daughter in matrimonial home and leaves with son to maternal home

We are married for 16 yrs now and got 2 kids. Elder son 15 yrs and younger daughter 13 yrs. she first left home 6 months back with out my permission, even after denying, with both the kids, disturbing their school. I was attending my father’s health issue out of station, who had a brain stroke during that time. By the time father brought back to my hometown, paralysed due to brain stroke, her father brought them back to the home in city. I returned to city home and the next day, while i was getting ready to office, her father asked whether he can take them to her maternal home for 4-5 days, quoting the indifferences we had And I replied that I am not willing but if she don’t like to stay that is her wish and Who ever stay I would take care of them. Left to office and returned in evening. She left with my son and left my daughter behind Coz my daughter is close to me. 3 months later my father expired after a struggling week in ICU And she attended as a guest for the formalities on day 1,5&11. Even during these days her parent justifies her with our relatives blaming me of harassment with words. Now she is calling my daughter only to have a quarrel about not coming with her at that time. She is not willing to come back (my sister spoke with her on a call) and no clarity on the kids future. He is in mid 10th class and attending online classes due to the pandemic. How can I bring my kid home so that i can take care of them? I may not be able to excuse her anymore for abandoning my daughter and no respect to my father and Trying to push me away and from my parents during all these years? Can i file Divorce in this case? She will never talk about divorce by mutual consent, but,She expects huge alimony and settlement, can this be avoided?