Why do they die and why is it good news for me

So Shannon has watched Disney movies for a long time.....you know how either the mother or the father always die (what is that about truely).....so this morning Shannon is watching Bolt (I have never seen it so couldn't tell ya about it) and I come in the room and Shannon is just balling her eyes out.....sobbing.....she says "Mommy Bolt died"....just sobbing....now I know this is normal....but for shannon this is huge...She is not one to really connect with her emotions.  And there is more...she is doing the monkey bars and a climbing wall when 6 months ago she could even pull her self up in the tree....she is putting full complete stories together.  Even strangers are (somewhat) understand what she is saying....I know these seem like little things, but trust me they are huge for us...it means there is starting to be a balance in the brain.  Small but giant steps.  Keep dying Disney characters, we are crying our eyes out over here....