Here’s the OP:

The situation is so complicated and I'll do my best to describe it properly.

I f28 have two bio brothers (Dave 31, & Paul 33), And my parents adopted our brother (Luke 25), Now Luke has been pampered throughout his entire life with us. Got college fund, a car, etc. My brothers and I got the same things but thing is we thought this was unfair seeing we're the bio children while he's the adopted one.

Anyways, Luke got married and recently had a baby, My parents decided to "surprise" him by adding his baby to their will aka inheritance. My brothers were furious and thought that was unfair, especially because Dave and his wife can't have and also, Paul isn't planning on being a parent, and I'm inf as well.

We went to see our parents and we had a fight about them playing favorites and adding Luke's son to their will while we don't get the same treatment because we don't have kids. Mom and dad didn't budge and acted like they were doing a "noble" thing making sure their one only grandchil is taken care of. Paul laughed then lashed out at my parents saying they were delusional to think that this baby is their grandbaby and remindee them that Luke is adopted and will eventually seek out his bio parents. A fight ensued and I agreed with my brothers and called my parents insane for the decision they made. Things got so heated we got told to leave after being told that it's none of our business and we had no right to protest.

Mom called me berating me about the stance I took and callinf them insane, She said she thought that I was the level-headed one and will understand, but I acted bitterly and appallingly just like my brothers. I hung up and we haven't talked after that. Recent update was that my brothers had a fight with Luke during which he threatened the police for "harrassement" of him amd his wife and son. I now firmly believe that my parents caused this fight between us with this decision.

AITA for taking my brothers side on this?