I don't know if they could be related but my bladder disorder causes me to find it very difficult to urinate, and sometimes I can't urinate at all which is why I presently self-catheterize through my ureathra. I also never empty my bladder fully which can be dangerous. I don't know if nerves could have this long-term effect on someone or not but I would suggest to your father what I do.
When I can't go to the toilet I just try to relax completely and not try to go to toilet and just let the urine drain without my trying to help it. This doesn't always work which is when I use a catheter.
I am assuming your father cannot catheterize himself? If he could then he could simply empty his own bladder using a catheter instead of having to have all these other troubles. I hope i've helped and haven't just rambled.
Take care x.