Very dangerous!!!!!
WOW.....Either you know and are aware of Gun Safety at all times or "Not" I guess???? Not to be rude, but is your Father compitent????? If NOT, he has no business using a Gun. People make mistakes, but with a Gun strict training and rules need ALWAYS be followed at all times. I mean, even at Gun stores where Gums are NEVER loaded, they always open the slide to show you the Chamber is clear before handing it to you!!!!!
The same care needs to be taken upon handling and cleaning your own Gun as well. To me personally, if you need to question if he needs a "Time Out" from the Gun.........He has no business whatsoever handling/carrying a Gun at all. That is how people get killed!!!!!!!! What if he had been pointing the Gun at his Face, Chest, Child, Dog........And so on!!!!!
Without knowing the Man it is hard to say.....Just give an opinion!!! My "OPINION" he needs to take a Hunter/Gun safety course to say the least. I have my CCW, but I also had my first Gun at 10, Hunter Safety at 12, years of training, CCW course in full as well as training with my Friend who is a SWAT LT. He has taken me through the SWAT Teams Course several times, showed me a ton of very usefull tips, and corrected me if I was doing something wrong!!!!
Spend $75-100+ to get him training if needed, if your father is "OLD", feeble, slow, on the verge of Alzheimers.........Take that Gun away 100% for good!!!!! I don't know if that's the case, but if any of what I said strikes home....Do yourself, your Dad, and the Public a Favor and take heed to the suggestions you asked for.
This is obviously more serious than (Should I take my Kids Video Games away).......

Best of luck!!!!!!