Add relationship between root bones of different parallel hierarchy

My scene graph has two parallel hierarchy.

  1. Body, which has animation like walk, talk, run, dance.
  2. Eyes, which have animation like blink etc.

For animation of node Body “dance”, it moves head mesh. Node eyes should move accordingly, but since it is in different hierarchy it doesn’t.
If I make root bone of node Eyes a child of a bone of node Body, my problem will be solved. Is it possible to do that?

Image of my scenegraph is as:

Here I want to make Eyes.SkeletonControl.Bone a child of Armature.Body.Body-entity.Body-ogremesh.SkeletonControl.Bone.