These Sets of Celebrity Brothers Are Evidence That 2 (or 3) Are Better Than 1

William and Harry are the two sons of Princess Diana. William is older than Harry by two years.

In addition to having their own Disney Channel TV series, the trio was part of the famous pop band Jonas Brothers. But what you probably didn't know is that they also have a younger brother named Frankie.

Ben and Casey are both award-winning actors and we often catch a glimpse of their brotherly love at award shows.

The Wilson brothers are all actors, while Andrew is also a producer. In 2005, they all worked on The Wendell Baker Story together; Luke and Andrew directed and Owen starred as Neil King.

The twins began their acting careers at just 8 months old and have starred in not one but two Disney Channel shows, The Suite Life of Zack and Cody and The Suite Life on Deck.

You may know the trio from their reality TV show, Wahlburgers, but Mark, Donnie, and Paul are also the brothers to Arthur, Jim, Robert, Tracey, Michelle, and Debbie, who passed away in 2003.

James and Dave are both actors, but they also have a third brother named Tom. Tom is also an actor and he's worked on a handful of films, including Spring Breakers and Rise of the Planet of the Apes.

All three brothers famously starred in the '90s TV series Brotherly Love, and Joey recently revealed that they have a new show on the way.

Not only are James and Oliver identical twins, but they also played Fred and George Weasley in the Harry Potter movies.

In addition to being brothers, Jared and Shannon are also bandmates in the rock band Thirty Seconds to Mars.

Ben and Fred both starred in '90s shows as kids; Fred played Kevin Arnold in The Wonder Years and Ben played Corey Matthews in Boy Meets World. They also have a sister, actress Kala Savage.

In case you didn't know, Liev has a hot half brother who is on Orange Is the New Black.

Chris has three siblings: a brother named Scott, who's also an actor, and two sisters, Shanna and Carly, who often accompany him to award shows.

Adam is a screenwriter and helped Zach write with his 2014 film, Wish I Was Here. They also have a brother named Joshua who is the author of three novels, The Daddy Diaries, Peep Show, and The Unthinkable Thoughts of Jacob Green.

Not only could Ansel and Warren pass for twins, but they are both in the entertainment industry. Ansel is an actor, while Warren is a director, cinematographer, and producer. They also have a sister named Sophie who is a photographer.

The former Glee star has a brother named Nash who plays guitar in the band Hot Chelle Rae, as well as four sisters, Summer, Skye, Harmony, and Charity.

Darren and Chuck are both in a band called Computer Games, and Darren is also known for his role as Blaine Anderson on Glee.

The Australian natives are all actors, and in case you haven't noticed, they're all pretty damn hot.