April 10 is National Siblings Day. To celebrate (and sort of just because), here are 10 pairs — or sometimes trios — of famous brothers and sisters.

The Arquettes are one of Hollywood’s most famous families, and there’s more to them than just Rosanna, Patricia and David. The A-listers and their lesser-known but still noteworthy siblings, Richmond ...

Kate, Ashley and Elizabeth Olsen are also siblings to Trent, Courtney and Jake. Here's everything to know about the Olsen siblings.