Hi, I understand your concern. This is sometimes happens with age related problem. You didn't share full details.
Trembling hands is related symptom of Parkinson's disease. But treatment is available.
To treat such cases, we need patient full history like - since how long is he having such problem.
Is he having high BP, or
diabetes or any other issues.
This is curable using homeopathy medicines without side effects
Next Steps
you can chat online. medicines will be sent to you through courier