Julia, from the 4 weeks mentioned in the OP, you must be either having your gender confirming surgery now or you have very recently had it. Congratulations on becoming a woman in body as well as in spirit.
I think that any reasonable person must now accept that you are a woman and that your spirit was always female. Hopefully, even your uncle and grandfather will realise that their transphobic campaign was futile and misguided. I hope that they eventually admit their mistake. If they do, it will be up to you to decide whether they can be forgiven after all you, as well as your father and brother, were put through.
Thank you, Julia, for everything you have written. Thank you for sharing your experiences and wisdom with frankness and humour. I hope to read much more in the future. The real touchstone of good writers is that people like to read what they have written, and you certainly have that gift.
All lives have ups and downs but I wish you a life that is as perfect as is humanly possible, now that you are starting your adult life as a woman in both mind and body.