Okay so kind of a long story, but I'll make it as short as possible. 

Okay so my brother and his sister in law are living with me, and my mother for now until they get back on their feet. They have 3 kids and one on the way.

Anyway my youngest nephew, who's not even 3 yet, started running a fever. It consisted for a few days and finally on the 4th day of him not getting better my mother finally made a comment that she needed to take him to the doctor. I guess my SIL got him together and took him to the ER and came back with a major attitude. Finally she started going OFF on my mom that she's been talking down to her and treating her like a bad parent and this and that, which my mom doesn't at all. She defends my SIL most of the time.

She kept making comments that she shouldn't of taken her child to the doctor because: "I'm his mom, i know this!" And acting all high and mighty. 

Anyway, some intel; When i was 11 or so I broke down with a major headache. It felt like someone was literally beating my head with a hammer and i distinctively remember my mom scoffing about it, saying it was a migraine. She knew it was a migraine. It wasn't until my dad forced her to go to the ER with me that she did. I remember my mom even sitting in the waiting room with me while i threw up blood and bile, saying that it was stupid and it was just a Migraine.
Well moral of the story is that it turned out I had an AVM which is a rare thing that would of killed me that night.

Anyway i thought about this story and calmly went into the living room and said; "Hey I have a story" and both my brother and SIL started going off on me that I don't know shit and to stay out of it, and just being insanely aggressive towards me for even opening my mouth.

So; Am I the Asshole?? Maybe i am.