Question: Aiko, Princess Toshi is the only child of Crown Prince Naruhito and what princess who was born on December 9, 1963, and is a member of the Imperial house of Japan through marriage?
Sentence (from "Aiko, Princess Toshi"): Aiko, Princess Toshi (敬宮愛子内親王 , Toshi-no-miya Aiko Naishinnō , born 1 December 2001) is the only child of Crown Prince Naruhito and Crown Princess Masako of Japan.
Relevant evidence: Yes