Hey Dave,
You have a couple of options built right into the system with Presence sensors and iOS and Android phones used as presence sensors. That will allow you to use the geofence setup around the hub and therefore your home to alert you should he leave that area. This of course would depend on him carrying one of those devices. The other benefit would also be the ability to track those devices.
Of course the other option would be Open/Closed sensors (such as the ST Multis or similar units) monitoring your doors that could alert you if they are opened.
Once your system arrives, feel free to reach out and ask for help configuring your setup. There are many people here willing to help.
Regards,
David