Hi, is there a reason that he has not been prescribed meds?
It is when PD starts to really intrude on our lives that medication becomes useful. If the tremor is hindering life for him perhaps now might be a good time. On the other hand, it might be bothering you more than it does him.....
You need to discuss with him how he wants to manage things, meds can be helpful with tremor, but it is a good time for both of you to get informed, and don't be afraid of asking the neuro all the questions you have, that it what they are there for