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When I was creating a soccer-game I made the ball the child of the player. There was an enemy chasing me, but when he came to the point I catched the ball, he stood still.
So I think when you parent something, the child does not change his x/y positions. It took me some time to find that out so I wanted to share that with the world

Maybe this should be changed in the feature, but it's no neccesary as long as you know what happens...

the parenting makes it so when the parent moves the child moves with it and the child would have the same tranceparency and z depth

The x and y coordinates are relative to the actor's parent. (If there's no parent, than it's relative to the game centre) So if you want to calculate distance/direction etc. try using xscreen and yscreen instead (as they are always relative to the same location for any actor).