Extra marital affair

Hello, I am married ( love marriage inter caste) since 7 years and we have 4 year old child,My husband is having an extra marital affair in the Bank with his cashier employee she is also married and have 2 kids. This affair is going on from past couple of months, I found some love note and some strange word in love note and same exact word is her password of I'd . I tried to talk to her and her husband about this matter but she threaten me to complaint about my husband in bank and make him resign from his job. After all this threating she blocked him on WhatsApp and from calls but after two days they were still talking and meeting outside the bank enjoying but at home my husband is showing that I don't trust him so he does not want to talk to me. My husband's father threaten me and my family they blamed me and my family for this affair. Now my husband threating me and my family to give resign his job as I am asking not to talk her or meet her. I am leaving here with my parents right now. He is at his home right now on leave. But they stil going on. I have their previous call details and meeting videos but I don't know what option do I have. Please guide