My younger brother aPolyramus

I'm having a mental breakdown rn. Why the f* would you date 3 people at once? Poly- what?!
My younger brother came home with his three boyfriends. Suddenly make a confession to me. I'm speechless, irritated,crying and full of anger.

My father are the worst at relationship ( he divorce and remarry other woman 3 time) why would you-

As if our dad isn't enough! After he confessed to me, he have been these guys for 4 years
From high school to the uni.

I fully agree if you want to become gay or bi or asexual or other. Other than polyramus!

(Wait, is it polyramus? I don't remember)

I ran into my room and I start crying.... What I'm supposed to do? What have I done? I still can't accept the fact my y brother are in that kind of relationship.

I know it's not my problem but he's my younger brother. I can't help but feel angry, irritated and other my mixed feelings.

I'm sorry for other, I didn't mean to offend anybody but these whole thing are to big for me to accept.

I'm still to find a way to calm myself down.
Anyone know how?