OK, I finally get it. If they were alive on day 1 of 2020, they are entitled to the $600. It's just curious that neither of my two clients who died in July and in November 2020 received the $600. Only their spouses received the stimulus.

On a personal note, I received a check for $600 addressed just to me, but my husband of 50+ years who is fully alive received nothing. Odd.