Telling identical twins apart gets easier as you get older, but it was almost impossible for us when we were kids.
Our Dad’s solution was to call us by any name that came to mind. He’d walk into a room, look us square in the eye and say, “Harold, it’s time for dinner.” We’d be playing outside with our friends and he’d call us in at night yelling, “Maxwell, Geraldine, it’s time!!!” He often used Maxwell, Schwartz, Geraldine, Fred, Harold, Frank, etc,
It doesn’t make any sense and he still does it to this day, even when he’s visiting us separately in our own homes. What can we say? When trying to come up with a name for our company, we immediately thought of our Dad’s pet names for us.