Dear Sir/ Madam,
I with my wife plan to visit our grand son who is HK ID holder & employed in a multi national bank as an investment banker. We plan to stay there for 20 to 25 days. We request you to advise us the process & documents required to obtain visa for the same. For your information we both are senior citizens of India and living a retired life.
Also please advise if we can delegate our son to file and collect visa papers on our behalf.

Thanks, will look forward to your reply.
Best wishes