Meghan Markle's estranged half-brother has penned an extraordinary letter warning Prince Harry to call off the Royal wedding. Thomas Markle Jr, who shares the same father as the royal bride-to-be, says he has not seen his sister since 2011. 'This is the biggest mistake in royal wedding history,' Thomas Markle Jr wrote The 51-year-old, who shared his letter with In Touch magazine, wrote to Harry: "As more time passes to your royal wedding, it became very clear that this is the biggest mistake in royal wedding history.