In the movie, De la Cruz is so busy to organize and celebrate the Day of the Dead (in the Land of the Dead, of course) and does not even seem to care about returning and meeting his family (if he has one?)
There are apparently so many people who remember him because he's famous. The movie didn't mention about his family but I suppose he doesn't have any descendant to remember him. (TBD)
Why didn't he pass onto the Final Death?
Héctor explained to Miguel that unless there's a relative in the living world who remembers their ancestor, their spirit passes onto what they call the final death, the same fate that awaits him if Miguel doesn't take his photo home. (Disney Wikia)