Duck family (Disney) strip, Della writes to Donald that the boys had placed a firecracker under their father's chair as a prank and that their father had been sent to the hospital. This was the reason why the boys first showed up at Donald's house. Thereafter the father is generally assumed to have disappeared. In "The Richest Duck in the World", when Scrooge mentions that the few family members he had had disappeared, the boys respond "We know how "that" feels!" Donald's cousin Fethry Duck was created for the Disney Studio Program by Dick Kinney and Al Hubbard and was first used in
Donald Duck on comedy or he was recast as Scrooge's helper, following his rich uncle around the globe. Dozens of writers continued to utilize Donald in their stories around the world. For example, the Disney Studio artists, who made comics directly for the European market. Two of them, Dick Kinney (1917–1985) and Al Hubbard (1915–1984) created Donald's cousin Fethry Duck. The American artists Vic Lockman and Tony Strobl (1915–1991), who were working directly for the American comic books, created Moby Duck. Strobl was one of the most productive Disney artists of all time and drew many stories which Barks wrote and sketched