Thomas Markle said the letter was like "a dagger to the heart."
Women who marry into Japan's Yamato Dynasty automatically become members of the royal institution. However, any royal women who marry commoners must leave the family.
Princess Eugenie will marry Jack Brooksbank in the second big royal wedding of 2018 after Prince Harry and Meghan Markle's.
The couple will tie the knot on Friday.
Several of Eugenie's bridal party members are cousins of the royal family.
Families of celebrities can find themselves caught in the "reflected glory" of fame.
"I would do it for you for 1,500 my minimum is much higher," Samantha Markle said.
Thomas Markle said his royal son-in-law may have been a Trump supporter but added: "I would hope not now."
We've rounded up the 50 most spectacular photos of the past month, including a fiery Tesla crash, Real Madrid's Champions League victory and a terrifyingly realistic robot.
HR manager Claire Oliver sold her gift bag for tens of thousands just three days after the big day. She wasn't the only one.
The Duchess of Sussex page went live on Sunday on the official Royal Family website.
Tyler Dooley, 25, went to the Bacchus nightclub in the suburb of Kingston.
Sean Spicer probably won't be playing defense on these tweets.
One of the twins displayed an adorable wide smile at the royal wedding, which has since been turned into a viral meme.
The Duke and Duchess of Cambridge's children witnessed history in attending their aunt and uncle's wedding.
The 19-year-old is a rising star on the British music scene.
The bishop was invited by Prince Harry and Meghan Markle to give an address at the couple's wedding.