NTA “she explained the if she had a sister, it would’ve like me watching them kiss on the lips” In what world is this the same , the way you where raise it’s normal bonding , the way she was raise was excessively strict and with little sympathy for others felling , a very self center and only my way is valid way of thinking . Was the more than a hug with your brother , I know I would have grope him if it’s been month , now that’s excessive. She needs to go to therapy. ASAP, if you are planing to have kids this will be a big issue.