I agree about taking some space for yourself and separating yourself from the toxicity of it- even if only for a while.

You've got enough going on in life without giving him/them unavailable space. At the moment, what you think, feel, and do is so much more important than what they think, feel, or do.

Do you identify with being the scapegoat? If so, what's happened isn't the end, it's potentially just part of being cast in that role . A dysfunctional family system needs a scapegoat. That system without a scapegoat is like a house without a trash can-- where do you dump your garbage otherwise? Scapegoats are very important. Some practitioners see them as the most important role in the family- because without a scapegoat the rest of the family can't deal with their stuff and has nowhere to dump it.

Anyhow, if that resonates with you, here's a longish, but excellent video about being a scapegoat. This guy is great, not only does he explain things well, he's also a survivor of a very dysfunctional system, and he tends to give practical advice/exercises to work on those issues.