Hoping this fixed it!!! Thanks to your suggestion about notifications, I noticed an edit button. That didn’t work. But then there was a tiny symbol (like a slightly turned peace symbol) in the bottom right corner of notifications. I clicked on that and gave myself one time access. THAT was where I could uncheck reminders and messages. Not sure why I could uncheck those in his account from my account. AND had to go into his account to uncheck?!?

But thanks to everyone who helped with this!!!

Not sure why I could uncheck those in his account from my account. AND had to go into his account to uncheck?!?

My guess is that his account was set up as some master account, though a different term was probably used. You'll need to research this to see how to switch it.