Just got off the phone with Mom. Dad had some more tests done today, with no conclusions yet. He had a rough day on Saturday, with Mom suspecting he took one pill too many. She's putting his pills away where he can't get at them now.
She also asked me for help watching Dad over the weekends, since if he has any sort of accident, there wouldn't be much she could do except call 911. My sister Rae has agreed to watch him during the weekday. It's a measure of how tired Mom must be that she asked for this help at all. It's not like her. But then, Dad isn't exactly like himself. He was weak after the cancer surgery, but in the past few months, especially after that infection he suffered over Thanksgiving, he's growing steadily weaker in body, if not in mind (and in that I haven't any way to judge.)
He's fading. We all know it, even he does, and there isn't a blessed thing any of us can do about it, except help as best we can without infringing on his dignity.