You may wish for him to take the HK Airport > Macau bus (
https://www.macauhkairportbus.com/service.php?lang=en) rather than the HK Airport > Macau ferry, which currently has three sailings per week.
If you want to travel together by ferry, he has to go through immigration and you both go to Sheung Wan (or you can also arrive by plane into HKG). Otherwise after he goes through HK immigration you can both make your way to the HZMB HK port and take the shuttle bus, which is cheaper but involves hassle.
Thank you, yes I heard about the bus hassle and tries to avoid that.