Rihanna's long-lost sibs were each born during different relationships before their father, Ronald Fenty, married Rihanna's mother, Monica.
Rihanna, whose family calls her by her given name, Robyn, was 15 and not famous when she first met her eldest sibling, 32-year-old Kandy, who showed up at the Fentys' door and explained who she was.
"I guess you could say I was shocked," Ronald Fenty told the British tabloid. "But I was a bit on the wild side and something of a ladies' man back in my early days."
Rihanna has devoted fans in her nieces, 14-year-old Brandy and 11-year-old Crystal.
"My girls thought she was great fun and now, of course, they love the fact their auntie is one of the most famous singers in the world," Kandy said. "They love her music and are always singing her songs at the top of their voices."
The other secret siblings are Samantha, 30, a policy consultant for Caribbean regional governments, and brother Jamie, a 27-year-old graphic artist.
The R&B star maintains a warm relationship with them, the Sun said, dropping by for visits when she returns to Barbados for family events or official functions.
Rihanna is also close with her younger brothers, Rorrey, 21, and Rajad, 15. On her way to see Arcade Fire at Coachella, she tweeted birthday wishes to her baby brother: "Happy BIRTHDAY to my baby bro (I still think he's my son) RAJAD!!! Sis love you booj, even from a million miles away! Wish I cud squeeze u."
Sounds like one bigger, happier family.
— Noelene Clark
Photo: Rihanna at the Coachella festival in Indio on April 16. Credit: Christopher Polk / Getty Images.