Sommore and Nia LongWe sure didn't know this one, but it's true! The Queen of Comedy and Miss Love Jones are half-sisters.
Tia, Tamera, and Tahj MowryOf course we know twins Tia and Tamera are siblings, but did you know that Smart Guy star Tahj is their little bro?
Shirley MacLaine & Warren BeattyDid you know that the Terms of Endearment actress and the Heaven Can Wait star are sister and brother?
Jennifer and Lynda LopezWe don't often get to see them together, but J. Lo's hermana is TV host Lynda Lopez.
Blake and Robyn LivelyWe wonder if Blake got some early acting tips from her big sis, actress Robyn Lively, who stars in Teen Witch, and has appeared on shows like Doogie Howser, M.D. and Twin Peaks.
Steve and Sherwin “Wood” HarrisOne played a lawyer on TV, the other a drug dealer. But did you know they were brothers?
Cherelle and Marvet BrittoOne famously sang duets with Alexander O' Neal, and the other is a power publicist. Who knew Cherelle and Marvet Britto were sisters? We didn't until now!
Mary Kate, Ashley, & Elizabeth OlsenEveryone knows the Olsen twins, but they're younger sister is a rising star.
Elle and Dakota Fanning
Dakota and her little sister, Emma have blockbusters galore.
Chris and Liam Hemsworth
This pair of brothers always makes us do a double take. We're happy that there are two of them!