Hi, since you can't parent one mesh to another I'm not quite sure what you're asking.
Please provide a screenshot of the tree focusing on the meshes in question, so we can better help.
To parent a mesh to a specific bone all you need to do is drag the mesh, or the slot containing the mesh, to the bone you want to parent it to. Alternatively you can select the mesh and press Hotkey P and then select the bone you want to parent it to.
