Welcome to HCM. I am Dr Anshul Varshney.
I have read your query in detail. I understand your concern.
I would suggest you to get following investigations to see for the cause of this problem :
1. Viral Mrakers
2. Anti HAV and HEV
If problem persists, he might require workup for other causes of hepatitis
like Autoimmune, Wilson's disease
This is my best advice for you with the available details, if you have any further query, please ask us.