BERT (3 letters) The term 'A Bobbsey' is a reference to the Bobbsey Twins, a series of children's novels written by American author Laura Lee Hope. The two main characters in the series are NAN and Bert Bobbsey, who are siblings. The crossword solutions for the term 'A Bobbsey' are NAN (3 letters) and Bert (3 letters). NAN and Bert are the two main characters in the Bobbsey Twins series, and they are both siblings.