My elder son wants to be with me

I am in an unusual situation. I got married in the year 2010 and I have 2 sons. Elder one is 11 years and second one is 6 years. Mine was inter-religion love marriage and things started turning out bad very soon after our marriage. I was suffering from bad marriage but could not come out of it because of my kids. in the year 2020, during corona peak time, my husband and I were doing night shift. He does evening shift and I do day shift. He was continuously getting calls from internet numbers and he used to go out late in the night to meet someone and that too during the tight lockdown time. I felt there is some serious issue and forced him to tell the truth. He disclosed his extra marital affair to me he said that girl is threatening him that she will commit suicide and mention his name in the death note if he does not meet her so he was running to meet her and console her. I was heart-broken and could not take. I shattered and had a big fight which went to the extent of he attempting to kill me and I managed to push him and his parents stopped him. I informed my brother that he has done too much and I cannot take this anymore and i will report this to police. He heard that and acted as if he is guilty for what he did and asked me to go to my parents house to relax for few months till this issue settles down in our mind. I was so upset and felt that I badly need a break and decided to go to my parents house. My father who was against this inter-religion married allowed me to come home, with a condition that I should not bring my kids. I had no option and went to my parents house with no other option. he tricked me and he understood my intentions of filing a legal case on him and took my sons and with his parents he fled to his native (near Kanyakumari) without telling me. He managed to travel very long distance during the tight complete lockdown period. He took that risk of travelling with young kids and old parents to save himself from legal issues. and told everyone with i left my kids. I did not know his native home details. I have been there just twice but dont know how to reach there. Did not know the exact address of where their house is for me to reach there. He stayed there for 2 years keeping my sons away. I thought this corona will end and they will anyways come to bangalore and I can deal with them after they come to bangalore, but corona extended and they finally came back to banglaore after 2 years. but they changed the house and stayed in some other house. My elder son got my address. He filed a divorce on me now and kids are still with him. How will I get my elder son with me. He is crying and wants to be with me. I have claimed for my sons and case is still going on.