Horatio Dinsdale was the husband of Edwina Forayter. They had two children named "Happy" Dinsdale and Udell "Spunky" Dinsdale.

Horatio is first name of the Sea Captain. He seems to bear a very strong resemblance to Albert Einstein. He is the maternal grandfather of Orville Simpson and the great-grandfather of Abe Simpson and great-great-grandfather of Homer Simpson and the great-great-great-grandfather to the Simpson Children.