Stopped by dad’s house on way to work, dropped off some leftovers, listened to Him recite his morning routine, went to work.
Driving home from work, phone rings, it’s Him;
“Well where the hell have you been? Where are you now?!” He sounds rather agitated.
“I was at work today, I’m driving home now.”
He laughs, “Oh. Well let me tell you a funny story about my day.”
He proceeds to tell me detail upon detail of his day. 
One of those details, “I tested my oxygen today and it said 76 or 79…I think it’s broken.  I’ll test one of the boys tomorrow and see what they read, maybe I need batteries.”
How do you convince that man to wear oxygen?
Maybe if his oxygen levels were normal he’d remember I work.