Mecanim: Holding sword two-handed?

Hello World! I’ve got to create an animation for two-handed sword in Mecanim, but I don’t know how to “attach” both hands to the handle (so they move together).

In one handed weapon it’s easy - simply making the sword as a child of one of the hands is enough. But how do I attach the hands together, so they stay together on the sword’s grip during movement?

You may have to use IK and set targets for the hands.