Parent object gets Childs objects component "Box Collider", like it would be a part of it..

I have 30 about objects, that are parented to one object. Everything works fine, except one thing.

1.) If I’ll hit one of the child (that are parented to one object) objects with physics object - nothing happens. Child objects not moving, and not doing anything with parent object.

2.) if I’ll hit the parent object (the one with 30 childs), they all rotating around my parent object.


The problem is, that I want to (1) would act as one big object, like (2). I mean: If I’ll hit one of the child (or more, at the same time) objects with something, that amount of child abjects and parent object, would act as one big object, that gonna rotate and move - how it would be as one mesh.

Is there any way to do it fast? The
collision of every child object should
exist (not to be removed and added to
parent object), just translating it
self to a parent object - because
every child object has its own
function, and also acts on a mouse…

Rigidbody on the parent, Box Collider on the Parent&Children.
That sort of setup should do the trick.