Thanks again to all for your kind advice regarding Mr. Foosh, aka His Majesty, aka Mr Picky Eater.
The suggestions about Hikari food might be the trick. I went down to the local pet store where I bought him, and purchased some Hikari Bio Gold pellets. Not cheap compared to Top Fin, but I am hoping that he will like them better. Cost is no concern when dealing with a family member.
I also spotted Hikari Freeze-Dried Brine Shrimp. And they are fortified with nutrients (unlike his favorite bloodworms), so I figured that I would give them a try.
SUCCESS!!! He LOVES Hikari Brine Shrimp. He goes into full attack mode when I put them into the tank, just like Bloodworms. So I have kept him on Brine Shrimp for a few days, I will try him on the Hikari Bio Gold tomorrow and let you know how he takes to them. But thank you, thank you, thank you to all the kind people who posted suggestions.