Parent/child ratio

Ok, so let's say I have a parent empty gameobject with child cubes as rigidbodys. If one cube moves and does it's rigidbody business, will that affect the other cubes in any way? So if that one cube say is blasted at a certain force in a certain direction, will the other cubes also be blasted? Or does that only happen if I alter the parent? Thanks.

I'm pretty sure it'll do what physics do... I had some cubes go into another cube, and it pushed the other cube off the map haha.