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 Japanese officials said Tuesday that Princess Kiko , the wife of Emperor Akihito 's second son , Prince Akishino , is pregnant , raising hopes for a long-awaited male heir to one of the world 's oldest hereditary monarchies and throwing into doubt imperial law revisions that would allow a female line to hold the throne . 
 Akihito, Prince Akishino
Please list all entity pairs containing a certain relationship in the given options.Output format is "word1, word2; word3, word4". 
Option: nationality, country capital, place of death, children, location contains, place of birth, place lived, administrative division of country, country of administrative divisions, company, neighborhood of, company founders 
Text: {0} 
Answer:
 Akihito, Prince Akishino