well it's just like that old song Your wrist bone is connected to your arm bone your arm bone isw connected to your chest bone... Notice how your arm bone is not attached to both your chest and abdomen bone, as it seems your creation is. I would bring it back into the setup room and then make sure that the parent body part has at least one ring of polies around teh child body part, this way there will be no tearing of your mesh.

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