Growing up we always got mistaken as either each other or twins, because we looked so alike and I was so small for my age. There's some pictures where it takes family a few seconds to figure which one is me and which one is her. My dad keeps joking that we're misplaced twins.
Just about a year ago I came out to my family as being transgender, and my sister started kicking their butts towards tolerating me.
Even now though we still match. We have basically the same glasses, same hair color (I lost a bet so it's now red), almost the same height and still the same attitude.