Froebel-Parker's book about paternal and maternal Harrington ancestors is the second book dedicated to his "Ahnentafel." Friedrich and the First Kindergarten dealt with his ancestor, Friedrich Froebel, founder of the first kindergarten. In Grandma Harrington and the Queen's Wardrobe, Froebel-Parker recounts the story of Mary Rogers, Lady Harrington, wife of Queen Elizabeth I's favorite godson and recipient of many gowns from the queen's royal wardrobe. He sews the connections between the Harringtons and Tudors into little Robert Harrington's journey to the Massachusetts Bay Colony as part of the Winthrop Fleet in 1630.