The Judds - Mother/Daugher
Anthrax - Charlie/Frank Uncle/Nephew
The Righteous Brothers.
mmm
Gipsy Kings. A whole bunch of brothers and cousins.
The Partridge Family had stepmother & stepson Shirley Jones & David Cassidy.
Guy Lombardo had two of his brothers in his band. I think the Ames Brothers actually were. Judy Garland started in a group of her sisters.
Well, kind of, but not at the same time. Otherwise, you can count Zeppelin, as Jason played the drums in the 2007 reunion. (Unless there’s another family connection in Skynyrd I’m missing. I’m thinking Ronnie and Johnny here.)
The doom metal band Anathema features two sets of siblings: Vincent, Daniel & Jamie Cavanagh (vocals/guitars/bass) plus brother & sister John Douglas (drums) and Lee Douglas (backing vocals).
The Magic Numbers consist of two brother/sister pairs.
Ben Watt and Tracey Thorn, aka Everything But the Girl, are husband and wife.
Kristin Hersh started Throwing Muses with her step-sister Tanya Donelly.
Tim Finn was a touring member of brother Neil’s band, Crowded House.
One more: Jim and William Reid, from The Jesus and Mary Chain - brothers.
And of course they were together in Split Enz.
The earliest incarnation of King Crimson had Michael Giles on drums and his brother Peter on bass. Peter was replaced by Greg Lake, but returned to play with his brother on one album only:*** In the Wake of Poseidon.***
Gladys Knight’s brother Merald (“Bubba”) was one of the Pips, and was widely regarded as the real boss of the group.
For many years, the rhythm section of Styx consisted of twin brother John Panozzo on drums and Chuck Panozzo on bass.
John died from alcohol abuse years ago. Chuck is alive, but only plays with Styx occasionally.
Steve Winwood and his big brother Muff were in the Spencer Davis Group together, where they recorded “I’m a Man” and “Gimme Some Lovin’.”
The original lineup of Renaissance didn’t feature Anne Haslam, their best known member. The original lineup was led by former Yardbird Keith Relf and his sister Jane Relf.
For a long time, drummer Albert Bouchard played in Blue Oyster Cult with his brother Joe, the bassist.
Also Jerry and Bob Casale.
Willie Nelson’s sister Bobbie has been a member of his band, the Family, for 40 years now.
Doug Kershaw had several hits with his brother Rusty back in the day.
The Sutherland Brothers and Quiver
[The Cornelius Brothers and Sister Rose](cornelius brothers and sister rose wiki)