MrsGee, I did think that may have been your reason, l had a PSA of 6.9 missed at the age of 59, I didn't know I had a PSA test and knew nothing about prostate cancer. My estranged father died of prostate cancer and although there was some limited contact with him and I went to his funeral, I didn't find out he had died of PCa until after I was diagnosed.
I was eventually diagnosed at 62 with a PSA of 7.7. I am now eight years post surgery and five years post salvage RT and still have a rising PSA. On bad days I do have the "what if" thoughts, but I don't dwell on it.
I am sure you already know a PSA of "around" 0.2 is the trigger for further action in your OH's situation.