Feeling...WTF?

I know I'm bipolar, and it has a certain stigma. Oh well, that's the way people want to be. Fuck 'em. Found out my niece had a baby today. Don't know the gender (guess my brother's wife assumed I'd know) but that's not what I'm feeling upset about. She emailed my two sisters. Not me, or my parents. Seriously - what the fuck is that about? That makes me feel really left out of important events in my family. My parents are probably more of the "at least we know" camp, but I am honestly pissed. Why was I left out, and why was it left to my sister to share the news?