Yes, I have and it is very common. When I told my Dr’s nurse practioner, she immediately sent me to a speech therapist. I was especially having trouble with liquids and pill. The therapist had me just “practice” swallow 10 times in a row, 3 times a day. You have to do it with no liquid or food, just swallow. It was really hard at first to swallow 10 times in a row, but after about 2-3 weeks I noticed a big difference. Swallowing became easier and a lot less chocking. I’ll have to do it the rest of my life because if I stop, swallowing difficulties will return, but really, such a small thing for big rewards. I still have a little difficulty but nothing like before. She also gave me some swallowing techniques.
Does your dad’s Dr. know? He might be able to help your dad, or send him to therapy. It’ scary, and when food or liquid goes down the wrong way, it can lead to other problems. Wishing the best to you and your father. Hugs!