US Edition Father
Stanley Johnson is well-placed to offer his son advice on the art of politics. Educated at Sherborne School, Dorset, and Exeter College, Oxford, Mr Johnson, 67, is a descendant of the last interior minister of the Ottoman Empire, Ali Kemal, who was murdered by Turkish nationalists in 1922.
After working at the European Commission, Mr Johnson, right, served as a Tory MEP from 1979 to 1984, and stood as Tory parliamentary candidate for Teignbridge in Devon. He is still on the list of candidates for the party, and said yesterday that he would be happy to be considered for his son's seat of Henley when the new London mayor vacates it.
A long-standing environmental campaigner, he was awarded the Greenpeace Prize for Outstanding Services to the Environment in 1984. He writes extensively on travel and the environment.
Mother
Charlotte Wahl, an artist, brings a more radical dimension to his political heritage. Her father Sir James Fawcett was a prominent barrister and member of the European Commission for Human Rights. Her ancestry includes the early feminist and suffragette Millicent Garrett Fawcett.
In 1964, she gave birth to Boris in New York, where her husband was on study leave, and returned to England soon after to take her finals at Oxford. She divorced Stanley Johnson when Boris was 14, and moved into a maisonette above their home in Notting Hill, west London, with the children.
Wife
Marina Wheeler, his second wife, brings to the Johnson household the forensic skills of a lawyer. The daughter of the veteran BBC correspondent Sir Charles Wheeler and mother of Boris's four children Cassia, Milo, Lara and Theo, above, Marina was a childhood friend who Boris met again while both were living in Brussels and he was covering the European Commission for The Daily Telegraph. While there, she helped him pick up the pieces of his first marriage to Allegra Mostyn-Owen and they fell in love.
A barrister who specialises in discrimination claims and mental health cases, she forgave Boris after he had an affair with the writer Petronella Wyatt during his stint as the editor of The Spectator.
Sister
The new mayor's family policies might well be influenced by his sister Rachel Johnson, whose novel The Mummy Diaries cast a wry look over motherhood in the capital. The 42-year-old Oxford-educated novelist, right, has a column for The Sunday Times and has also written for The Daily Telegraph, Evening Standard and Hello! magazine.
Her husband is Ivo Dawnay, journalist and communications director of the National Trust.
Brother
Should Boris Johnson need guidance on City Hall's relationship with London's business leaders, he could seek the advice of his brother Jo Johnson, who was recently appointed the editor of the Financial Times's Lex column following a stint as the newspaper's south-east Asia bureau chief.
He is married to the award-winning journalist Amelia Gentleman, New Delhi correspondent of The Observer.