4. Rihanna 32, and Rajad Fenty 24.
Rihanna is 8 years older than her brother Rajad, and we can see that they are in a great relationship because he often posts photos on social media with his sister.
5. Nicole Richie 39, and Sofia Richie 22.
Nicole is the adopted daughter of performer Lionel Richie. She has a sister Sofia who is 17 years younger than her.