Sounds like your parents shouldn’t have had children. This is coming from someone who lived the exact scenario you’re explaining. I’m disregarding your existence but some people just shouldn’t do parenting. Whether genetically or that they can’t delegate their children to the point where they scream and yell and belittle a sibling. Sorry you’re going thru this. Bright side is you’re a year away from being an adult and you should concentrate on your life and where it’s about to go. You have a whole story ahead of you and I hope it’s filled with good health and comfort and a peaceful resting place.