That’s tough. I’ve had the same thing happen and I am getting closer to that category but I ain’t there yet!
True story. Our third baby was involved in a hostage situation a few days after birth. When the situation was finally resolved, we had to go to a hospital before they would let us see him. When we got there, the emergency room receptionist responded when we asked to see our son, “Oh, are you the grandparents?” Granted, after childbirth and a horrendous hours-long crisis, we were trashed but I don’t think we quite looked like grandparents.
Three years or so ago, I took my mother (85 or so at the time, and I was probably not yet 60) to the blood lab for her tests.....the Latina receptionist referred to her as "your wife"; I chalked it up to the 'we all look alike' syndrome..................sort of.