KateCanada, I don't know about convincing him, but you've got to keep on prepping regardless.
I also don't know what you have or need, prep wise, but...
A lot of what you might still need to stock up more of is stuff you always need and use on a regular basis already. That's the easiest stuff to rationalize getting more of to a DGI until they start coming around.
All kinds of food and food storage supplies is top of that list, OTC medicines & prescriptions, even washing soap, toilet paper, razors, etc. Most everything you buy regularly and consume.
Find good deals on the above and load up and also remind him proudly, as he see's it stacking up, that the costs for all this stuff, that you just got on-sale and by buying in bulk, will also be going up in price anyways. You are thus saving money on stuff you are going to need and use anyways even if, heaven forbid, TS never HTF!
Same goes for loading up on every type of ammo caliber he has guns for, as it's going up in price darn near monthly and lasts forever, storage-wise. Same thing for cans of oil and five gallon jugs of fuels for your vehicles and generator, etc. Everything that's going up in price is well worthwhile you getting more of now before it does.
Then start stretching that to expanding your garden, to save money on food, with supplies and tools and then maybe chickens and rabbits, etc.
Be creative, find dual uses for other needed stuff, best as you can, to rationalize getting them, too. Wife of one customer here would absolutely not buy into the need for a fallout shelter in their backyard, but she did OK her husband coming home with a combo tornado shelter, wine cellar, root cellar, which was the same fallout shelter.
Good Luck to you, KateCanada, I know it's hard, but reality or oftentimes just somebody else telling him what you've been saying all along will eventually awaken him some and if you are easy on his ego then with few of those well deserved "I told you so's" he'll be more likely then to also eagerly step up to the plate.
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Shane