Today is National Siblings Day! Since we’ve already celebrated with your favorite celebrity siblings, we decided to do a fun guessing game for One Direction fans! Each member of the X Factor band has one or more siblings, and we want to know how many you know. Bonus points if you know their names, too!

Click through the gallery to test your knowledge, then let us know in the comments below how many you got right. Which ones stumped you?

one-direction-siblings-day sibling-5 lottie-tomlinson sibling-8 ruth-payne mike-twist-harry-styles sibling-6 fizzy-tomlinson greg-horan daisy-and-phoebe-tomlinson