Possible Clues:

• Like the Romanovs
• Like hereditary rule — and city’s, oddly
• Family crunched its candy
• Duke, awfully nasty, in charge of powerful family
• Like the New York Yankees, historically
• Of ruling families
• Relating to (ruling) family
• It's candy that makes it like 4 down
• It's candy (anag.)
• Re a ruling family