basic food items, the same things they already eat, plus dry foods such as rice, beans, etc
There's really no need to stock up too much on the MH or MREs. People don't normally eatthem in their daily diets, so they don't get rotated. Plus, as has been said many times, you should stock up on the things you are used to eating. A diet you are used to can be a great comfort in trying times.
How's he planning on cooking if the electric and gas are not flowing? Might look into a propane stove and fuel for it. @0 lb cans with extension hose are good to have. They also work for camping.
How will he heat in the house? The Mr Buddy systems are great and not expensive. They also use the small bottles or can hook up to a 20 lb tank. I got 2 of these heaters during an Amazon sale.
Batteries and solar charger.
Gas lanterns. Either Coleman fuel, or preferably, again, propane types. If you get all of your emergency heating/cooking/lighting equipment to use the same type of fuel it simplifies things a lot.
You'll need spare mantles, etc.
Don't forget comfort items.