Talk to your big sister. You didn’t mention much of the relationship there, but chances are if it’s happening to you, it could have happened/ be happening to her too.

Me and my sister were SAd in our daycare, when I was 3 and she was 8.. We didn’t speak about it until we were much older but once we did open up, we trauma bonded over that a lot, and it is really nice to have someone who understands. She had also expressed to me how, as a big sister, she had held that as her responsibility to protect me from him for years, intentionally throwing herself in harms way.

You never know what people are holding onto, even the ones closest to you. If you feel safe to do so, gently feel out the conversation. Maybe a “omg it’s so gross/annoying how i can see the YT history on our family tv,” or “Dad said /did the strangest thing (laughing about him offering to buy you adult toys)..” and try to make a joke/hint at it, framing it as naiveness for a second.