The 28-year-old singer shared a sweet message for her grandfather on Instagram by posting a picture of herself with him.
"Captain of the ship... My grandfather #Bravo! Such an inspiration to the 4 generations that came after you (so far) and as a result of you," she wrote along with the picture.
The "Diamonds" hitmaker went on describing how Braithwaite met his grandmother 61 years ago.
"It was "only" 61 years ago that you met my 17-year-old grandma #Dolly and bought out her entire tray of mangoes, just so she didn't have to work and could spend the rest of the day with you!
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Rihanna said she is happy that God has been so kind to her grandfather by allowing him to celebrate his birthday even at the age of 88.
"Your strength, love, prayers, discipline, sense of humor and STUBBORNNESS ??are just a few of the things we love about you, and why you're truly our guardian angel sent to us from Heaven!
"I love you with all my heart, and I'm so happy that God spared you to see the 88th year of your life!!! HAPPY BIRTHDAY OG," she concluded her post.
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