I want to know if it is possible to make an object children of a specific bone during the game.
in 2.7x, no. what you do is parent an empty to the bone and reference the empty.
you can easily parent a empty to the bone though and use that to look it up
for child in hitBox.childrenRecursive: if 'Bone_Empty_Property' in child: object_1.setParent(child) break