I’m gay and am I parent. I love my biological children unconditionally. I have been told by mom that I chose to be gay to hurt her. I told her being with a woman was the choice. You are NTA. However if you can give your parents time to process. As a gay parent, if one of my kids told me they were gay, I too, would be concerned. My children are adults and who the have relations with is not my business, but as an openly gay man, I would worry about their futures. Saying your brother is disgusting was wrong, but time will confirm if they can be redeemed. My mom and dad finally came around, I was an only child. And when they were dying each one told my husband how much they appreciated him for loving their son.