some people might, and honestly that's on them. u be you regardless of what it might look like to others, as long as you're happy with yourself 💖 im trans and a big part of me transitioning was me coming to terms with the fact that people will judge no matter what sometimes but your happiness and your life is more important than their opinions.
i don’t think it’s weird! i think you are putting a little bit too much weight on what other people think. you deserve to transition and live as your real self. if it makes you feel better, i don’t think it is as uncommon as you think to have two trans siblings. my older sister is transfem and i’m nonbinary, and that doesn’t make either of us less trans :)
Actually having LGBTQ+ family makes it statistically more likely for someone else to be LGBTQ+, not less. Somehow it's at least partially hereditary. (As my (miswestern) mom likes to put it, "you and your sister got all that from the Mosier side of the family. My uncle, and his parents, and my great-uncle, and-"). So technically you're in the majority! (Also, generally don't live your life in fear of how "abnormal" you are compared to "average" - you can't do it)