Albert Solomon, who is the maternal grandfather in the family and is commonly called “Pops” on the show, is not a part of the show’s latest episode, instead, “Pop Pop,” the family’s other grandpa, shows up with surprise tickets for a winter cruise to Canada. Eventually, Beverly discovers that Pop Pop had an ulterior motive for offering the cruise tickets.
Although Judd Hirsch’s Pop Pop was all over the episode, many fans were worried about what had happened to George Segal’s Pops, who is a much more frequent part of the show’s cast. There’s no solid explanation offered in the episode for Pops’s absence, but some have speculated that he wasn’t part of the episode for reasons that have nothing to do with George’s health or the health of his character.
Instead, some fans suspected that the writers had left Pops out of the episode because there was just no room for him in the story the show was trying to tell this week. It’s also possible that George’s absence from the episode had more to do with the budget than anything else. Because Judd and other guest stars were featured in the episode, there simply wasn’t any money to pay George for his performance.
Source : https://www.distractify.com/p/what-happened-to-the-grandfather-on-the-goldbergs