I am so sorry to hear this, Rachel. It sounds like he may be going through some seperation anxiety from your Dad. He is showing out to prove how upset he is. Responding to Mike's voice makes me think he listens to your Dad and with that, he makes the male voice an association. I know nothing about these things but I can certainly see your frustration.

As far as running the house goes......it sorta sounds like he might have taken over in their absence. Best of luck with this.