The 2 year old will be told when older that he/she killed his/her own mother and have to live with it for the rest of their life. Who's responsible for that.
The two year old may or may not even remember it. How much do you remember from age 2? If they told in the right way it may not affect them badly. On the flip side, it is possible they will remember it.
Again, it is a sad tragedy.
You know, I wondered whether a two year old would remember that event or not. I have to imagine it'd be pretty traumatic to have been party to that event, regardless of one's role as shooter or nearby observer. I wonder if it's sufficiently disturbing that it'd permanently etch on a two year old's memory. I don't know....
I do know that I don't recall anything from when I was two, at least not in such a way that I equate it with the time I was that age. I can remember looking at clouds from an airplane window, and I know now that I was three at the time, but I know that only because of our family photo albums and such.
I think, however, the real trauma for a two year old who shot its mother would come when they are older and can understand what they did. There too, though, I'm just speculating.