Attache&move

Hello!

I don’t have any idea how to move attach movie. What I wanna to do, I wanna attache movie clip to the stage(grey) and then i wanna attache another movie clip in to the stage( red) and another( blue). I wanna move just red and blue movie clip(axis:y) like they grow on grey movie clip.

I put example with motion tween, and how I imagine that.

anyone?