hi
@uktoday
I guess your dad is no longer recognising the signals his body gives him that he needs the toilet
have you contacted the continence nurse at his GP surgery?
definitely let the GP know
might you swap your dad's underwear for pull-ups (don't tell him, just take his pants and replace with pull-ups - if he notices make up some excuse and apologise that these are all that is in the house until you have a chance to shop) - tear down the sides to remove used pull-ups so no need to remove the trousers before taking them off, though you will have to, to get a clean pair on
watch him carefully - I know my dad has signs when he needs to 'go' eg fidgeting, pulling at his trouser waist - and if you see any signs, guide him to the toilet, trying to keep clothes 'up' so at least the 'product' is contained - I appreciate that this will then require a good 'wash and brush up' which may not be easy either
maybe have a commode in a place easier/quicker to get to than the bathroom - or a potty on hand
does he 'go' at regular (!) times each day - anticipate that and take him to the toilet at that time in the hope he'll 'go'