A warm welcome to the forum.
We have a lot of information on how people with Parkinson’s can manage their tremor on the Parkinson’s UK website which you may find useful for you dad. You can find this information here. Whilst we do not condone the use of cannabis, we have a lot of information on the potential therapeutic effects for Parkinson’s on our blog.
For further advice on your dad’s symptoms, you may want to consider contacting our helpline service on 0808 800 0303 and one of our members will be able to help you.
I hope you find the above information useful.