Honestly. I tried to point out how happier I was now and that I already started my transition. Basically they could not dissuade me. I also pointed out how I hoped they would be alright with my transition. And added that my brother and sister already knew and are supportive.

(And… also that my divorce was not a result of my transition but the affirmation of the self - which led to my transition- … I’ve denied my own identity in my previous relationship and prioritized the happiness of my ex-wife and did what I felt was necessary for the couple to work…)

Edit : also I had to try to make them understand what being “trans” meant in simple terms. Because the concept of gender for them was and probably still is just cisgender “female” or “male”.