Kinship

Here are some interesting results (as calculated on 20 May 2011, and subject to change as more gaps are filled in the database).

Prince William of Wales (Duke of Cambridge) is:

• Great(x27)-grandson of William the Conqueror, by at least 5,344 different lines of descent.
• Sixteenth cousin, once removed, of his wife Catherine, Duchess of Cambridge.

Charles, Prince of Wales is:

• Great(x26)-grandson of William the Conqueror.
• Eleventh cousin of his first wife Diana, Princess of Wales.
• Ninth cousin, once removed, of his second wife Camilla, Duchess of Cornwall.

Queen Elizabeth II is:

• Great(x25)-granddaughter of William the Conqueror.
• Second cousin, once removed, of her husband Prince Philip, Duke of Edinburgh.

King George VI was:

• Great(x24)-grandson of William the Conqueror.
• Fourteenth (half-)cousin, once removed, of his wife Queen Elizabeth the Queen Mother.

King Edward VIII was:

• Great(x24)-grandson of William the Conqueror.
• Unknown relation of his wife Wallis Simpson.

King George V was:

• Great(x23)-grandson of William the Conqueror.
• Second cousin, once removed, of his wife Mary of Teck.

King Edward VII was:

• Great(x22)-grandson of William the Conqueror.
• Fourth cousin of his wife Alexandra of Denmark.

Queen Victoria was:

• Great(x21)-granddaughter of William the Conqueror.
• First cousin of her husband Prince Albert.

King William IV was:

• Great(x21)-grandson of William the Conqueror.
• Third cousin, once removed, of his wife Adelaide of Saxe-Meiningen.

King George IV was:

• Great(x21)-grandson of William the Conqueror.
• First cousin of his wife Caroline of Brunswick.

King George III was:

• Great(x20)-grandson of William the Conqueror.
• Second (half-)cousin, twice removed, of his wife Charlotte of Mecklenburg-Strelitz.

Frederick, Prince of Wales (father of King George III) was:

• Great(x19)-grandson of William the Conqueror.
• Fourth (half-)cousin, once removed, of his wife Augusta of Saxe-Gotha-Altenburg.

King George II was:

• Great(x18)-grandson of William the Conqueror.
• Sixth cousin of his wife Caroline of Ansbach.

King George I was:

• Great(x17)-grandson of William the Conqueror.
• First cousin of his wife Sophia Dorothea of Celle.

Queen Anne was:

• Great(x17)-granddaughter of William the Conqueror.
• Second cousin, once removed, of her husband Prince George of Denmark.

Queen Mary II was:

• Great(x17)-granddaughter of William the Conqueror.
• First cousin of her husband King William III.

King James II was:

• Great(x16)-grandson of William the Conqueror.
• Sixteenth cousin, once removed, of his first wife Anne Hyde.
• Fourth cousin, twice removed, of his second wife Mary of Modena.

King Charles II was:

• Great(x16)-grandson of William the Conqueror.
• Sixth (half-)cousin, once removed, of his wife Catherine of Braganza.

King Charles I was:

• Great(x15)-grandson of William the Conqueror.
• Third cousin, once removed, of his wife Henrietta Maria of France.

King James I was:

• Great(x14)-grandson of William the Conqueror.
• Third cousin, once removed, of his wife Anne of Denmark.

Queen Elizabeth I was:

• Great(x13)-granddaughter of William the Conqueror.

Queen Mary I was:

• Great(x12)-granddaughter of William the Conqueror.
• First cousin, once removed, of her husband Philip II, King of Spain.

Lady Jane Grey was:

• Great(x14)-granddaughter of William the Conqueror.
• Third cousin, once removed, of her husband Guilford Dudley.

King Edward VI was:

• Great(x13)-grandson of William the Conqueror.

King Henry VIII was:

• Great(x12)-grandson of William the Conqueror.
• Third (half-)cousin, once removed, of his first wife Catherine of Aragon.
• Fifth cousin, once removed, of his second wife Anne Boleyn.
• Fifth cousin of his third wife Jane Seymour.
• Fifth cousin, once removed, of his fourth wife Anne of Cleves.
• Fifth cousin, once removed, of his fifth wife Catherine Howard.
• Third cousin, once removed, of his sixth wife Catherine Parr.

King Henry VII was:

• Great(x11)-grandson of William the Conqueror.
• Third cousin of his wife Elizabeth of York.