I have kind of the opposite problem. My dad thinks prepping is just an excuse for hoarding disorder. He spent years trying to convince me that canned food spoiled after a month!
Many canned foods last 3 years... officially and some long after the expiry date.
This is a comic tragedy...
My grandmother, from Rome, Georgia, was a child of the war between the states. (Please know I am older than dirt, and these are my memories of her intense desire to hoard, because of her memories).
She had canned food in her pantry that I knew enough not to eat, because it had been there for years, and looked a bit “bulgy” - she lectured me when I took too many “tissues” from the paper roll in the bathroom. I remember her today, when I use more than two little pieces to wipe the drips.
Trouble is, too many of us take so much for granted. Hoarding can be a problem, but canned food does not spoil after a month - maybe 10 years?
My late husband, Air Force reservist, had to open cans of food stored from WW2 in the very early 60s, and figure out how to serve it in the mess when the rations didn’t get there on time. When he told it, it was funny.
Now it seems like our future.
Good luck with your Dad, he must be a whole lot younger than me, or else he is unfortunate enough not to remember the rationing of WW2, when eggs were hard to get. My dad used to bring them into New York city from outlying farms, in his pockets, so he could give an egg to every pregnant woman he and his Navy buddies could find.
There is nothing new under the sun, except our propensity for forgetting the lessons of the past.
Time for me to get some sleep - good night to you, and kiss your dearest dad - he is right, fresh is best, but canned is better than not being able to get fresh.