I am sorry if I ever don’t deserve to address you as father. It is how I was made to understand through all my road of education that parents, irrespective of their conduct, are still parents. With these instincts, I am quite confident that you wouldn't mind my reference you as father. Though you never fathered me, you are still my dad.
P.S: I would be grateful if you could send your new ID photocopy to Punakha HSS.