Wife black mailing NRI husband

Sir My nephew working in Dubai as Technical Sales representative married to Indian girl in July 2017. It was discussed that he will take her wife to Dubai within 6-12 months after marriage. He stayed in India after marriage for one month and returned to Dubai. He asked his wife to stay with his parents at his house as his parents are alone. She just stayed for 2-3 months and start forcing his husband to either take her to Dubai and until he take him to Dubai she will stay with her parents. Nephew father struggled to make her Passport as she had name mistakes in Aadhar card, certificates etc. which delays the process of passport issuance. In January 2018, my nephew returned to India on short vacation to meet his wife and to take all required documents to process the Visa process. His wife said take me with you now or I will stay with my parents, and she left my house with his father, without getting my parents permissions or myself. Now from January to till date she is staying with her parents. She started to work even without my approval. We approach our Jamat to settle the matter but her father did not come for a meeting. Her father is saying either take her to abroad, if not she will stay with him. He is doing it all for just money. In these 8 months she sent so many bad messages to my nephew, she even told him a dog, bastard, a gay etc. and we have all WhatsApp messages saved. She did not allowed my nephew to have physical relation with her till today. They went to Ooty on honeymoon trip and even at that time she just avoided the physical relation by saying she is sick. She is asked to divorce her by sending message in WhatsApp and she is demanding 20 lakhs as settlement amount if not she is threatening to file a dowry and harassment case. I heard that our Indian government supports females in such matters which is really worrying me. They all doing it for money so how as a male I can take support from our law. How the law help in such matters and I am confused. I have contacted couple of lawyers in my city and they are threatening me by saying she may log a complaint about husband and his family members for dowry and harassment. Please advise on below. 1. We have all her messages sent in WhatsApp, will it be considered in the court. If I want to be attested these messages, how I can do it. 2. If she file a complaint what will the action from the police again us. 3. She is employed. Can she ask for compensation or settlement amount? 4. Not allowing having physical relation can help us to get Divorce from her. My nephew and we all family members are too worried about this blackmail. Please advise how we can handle this situation and advise for our steps. One of her close relative who is the mediator for this marriage is standing with us and he said he would tell the truth wherever we call him. Please mail me your advice at [deleted]