I'd be curios in knowing more about the cousin blowing up at you. What was the issue?
How would you feel about reaching out to that cousin. "Hey...what you had to say seemed important to you yesterday afternoon. Can we have a conversation about that?"

for ignoring the invitation for fighting/drama.
Note: I see these patterns you describe in FFw's family. A mystery for me is how the scapegoats got "picked". It's a bit of a further mystery in FFw family because while there generally is a golden child...SOLID GOLD (not FFw)...it appears random that the "rankings" change.
I compare that to my recollection of your story
zachira and there seems to be "stability" in the roles played in your family. Does that ring true to you?
Last thought: Assuming my recollection is accurate...does that bring up two different approaches to "fixing" or "healthy"?
1. A family where chasing around the drama triangle is the norm (roles shift)
compared to
2. A family where roles are fixed and anyone trying to change that role is "bad". (again..how do those roles get picked?)
Best,
FF