They are two sets of fraternal twins, the younger pair are Freddie and Flossie (the female is Flossie-my Mother had a dog by that name as a child!) the older set of twins be … ing Nan and Bert.Bert is presumed to be a contraction of Albert.hey are two sets of fraternal twins, the younger pair are Freddie and Flossie (the female is Flossie-my Mother had a dog by that name as a child!) the older set of twins be … ing Nan and Bert. Bert is presumed to be a contraction of Albert.