Finding Child objects in Unity(Dev Diary)

The characters in my game are made from a prefab that is essentially an empty game object with children that are renderable.  The problem is that as this empty object doesn't have a Renderable, there is no bounding box available for frustum culling.  So we need to find its children and aggregate them for visibility determination.  
Finding the children is actually quite easy as shown below once you know they are accessed through Transforms.  Fortunately I don't need to aggregate the children to generate the bounding box because of the way my models are designed.  Basically I just need to know if the face is on screen.

Plane[] planes = GeometryUtility.CalculateFrustumPlanes(localCamera);
if(GeometryUtility.TestPlanesAABB(planes, souls[i].transform.Find("face").renderer.bounds))
{
     print ("Visible");
}