Daddy has a big secret. When he was younger he needed to wear diapers. So when one of his boys is embarrassed about being put in a nappy, Daddy shows him this old picture. Look when I was your age I had to wear a thick cloth diaper and plastic pants&
Usually that does the trick. Suddenly a nice snug Abena or a Goodnite seems like a good option. Much better than babyish cloth and plastic.
The boys also like to have a laugh at the retro TV set in the background!