I had a transplant 6 months ago. I had not been on dialysis and was told that my old kidneys would continue to function for awhile until they finally gave up. So yes, right now I have 3 functioning kidneys. Everything is still a little scary for me still because every little ache and pain you wonder what it means. I’m sure this will get easier. Getting the drugs adjusted correctly is more difficult than I realized it would be. A few side effects are annoying. Again, I think this will improve. Good luck to both you and your Dad.