"Jack (born John Anthony Gillis) married local bartender Megan Martha White on September 21, 1996. In unorthodox fashion, he took Meg White's surname."

"During the early phase of their career, Jack and Meg White provided various descriptions of their relationship. In many early interviews Jack claimed that he and Meg were siblings, a claim which was widely believed and repeated despite rumors that they were, or had been, husband and wife. In 2001, proof of their 1996 marriage emerged, yet they continued to insist publicly that they were brother and sister. The couple were divorced in March of 2000 just before the band gained widespread attention."

because everything on wiki is true

The Shaggs fit in here too. There's another 3 sibling band (I think?) I'm pretty surprised no one mentioned The Allman Brothers Band. And The Replacements, weren't they brothers? And for most siblings in a band together, Jackson 5. Finally, I feel like the Jesus & Mary Chain dudes are brothers.

Here's a few

Statler Brothers
Isley Brothers
Bee Gees
Heart
Hanson
Black Crowes
The Breeders
My Chemical Romance

This could be more educational if you guys specified the band members rather than just listing the band names.

Wiki says the 2 founding members of the hip-hop/pop group Len are siblings Marc (guitar/vocals) and Sharon Costanzo (bass/vocals).

I actually really like this group a lot, but didn't realize this till just now. :)

Good call,

Nickel Creek has Sean (guitar) and his sister Sara (violin) Watkins. Also Chris Thile plays mandolin, and his father, Scott, played bass with the band until a few years ago. They are a mix between bluegrass and acoustic rock. I love em!

Hasn't anyone mentioned Kim and Kelley Deal of The Breeders or Bob and Tommy Stinson of The Replacements? There's also Win and William Butler of the Arcade Fire.

Haven't we talked about them already?:p: I think I've just had a bit too much exposure for my own good.

Yeah, you just breifly mentioned your mother liked them though. Nothing too heavy :).