Is it illegal to record voice someone without their knowledge

I bought simple new phone for my mother and she donot know in depth how to use phone ( She knows green to pick phone and red button to cut phone) so my wife placed memory card in my mother phone without her or my permission and change setting to "Automatic call recording on" so all incoming & outgoing calls were recorded and saved in memory card and she removed card and copied to her laptop and again placed card in mother phone. so she did this for 7 to 8 months with our knowledge and permission. Now she have filed DV Act and crpc 125 court case against whole family. Daily she fought with us without any reason and when my mother shared all conversation with my elder brother on phone then everything got saved in memory card so i have some doubts:- 1. Is it illegal to record telephonic conversation of two person without their knowledge. 2. Is it legal to record voice conversation without other person permission where i am one of the member of conversation. 3. Is it violation of Right of Privacy under Article 21 of Indian Constitution. 4. Can i raise this issue in court against my wife. 5. What else i can do against my wife to save my family related to this issue. Kindly help me asap and thanks for website to help people like us.