Possible Clues:

• Roosevelts' successors as first family
• President William Howard et al
• Family of the 27th U.S. president
• First family when D.C.'s earliest cherry trees were planted
• Political family spanning three centuries
• First family in 1911
• First family from Cincinnati
• Early 20th-century first family
• First family of 1909-13
• Onetime White House family