AITA for telling my parents they put all their chips on the wrong kid so they get to deal with the consequences?

I was 9 when the accident happened, so everything hit the fan before I ever got into my teens. Before that they didn’t completely ignore me, but everything still revolved around my sister and things like Christmas, birthdays, and activities were very one sided. I could only participate in activities that she wanted to do, anything I wanted to do was lowest priority. Like, one year I asked to go a certain theme park nearby for my birthday. My sister didn’t want to go, so we went to an arcade and pizza place she liked for my birthday instead. So, I went from being the “if it’s not inconvenient” kid to being completely forgotten about in pretty much every way.

/r/AmItheAsshole Thread Parent