Trying to get my main gun turret to rotate in one piece...all objects in red are in a family (purple)...then in one group (named).

I am trying to do an animation where the main turret is rotating on an axis.
I can get it to rotate where needed, but things come apart at that point.

The main part of the gattling gun either moves to the side...or everything comes unhinged when rotating.

Any ideas on what to do?...thanks! Mark