Get the beard lined up with M with M3 in the default pose, then go to the Scene palette. In the paltte menu (triangle button at top-right) select Close all to tidy it up. Select M3's head in the viewport, and the tree in the Scene palette will expand to show that. Now grab the beard's entry in the Scene palette and drag it onto M3's head's entry - the beard is now parented and will follow the head as you pose Michael.