Actually, we’re both wrong. They’re cousins.
The Duke of Wellington’s brother ruled India for the British for a time.
I agree: William (the psychology pioneer) and Henry (the novelist).
Bob Einstein has a brother named Albert. Yes, Albert Einstein. But you know them better as Super Dave Osborne and Albert Brooks.
Googling suggests it was Laurance who was involved in the founding of Eastern (David was 19 at the time).
Doug Fieger is the lead singer for the Knack, his brother Geoffreyis a lawyer famous for defending Jack Kevorkian.
In 2005 long-time CBS TV reporter Bob Schieffer became the anchor for nightly news report, and his brother Tom was appointed US ambassador to Japan.
No shit – he’s one of my favorite writers!
Well, interesting in that only two of the pairs listed are actually in different fields. 
Ashley Judd has a famous singing sister - and mother.
Although I could have guessed they were both members of the famous extended family, until Clement Freud’s recent death, I didn’t know that he was Lucien’s brother.
Poe, aka Annie Decatur Danielewski, is a singer (probably best known for the song “Angry Johnny” off her 1995 debut album). She created a “companion” CD when her brother, Mark Z. Danielewski wrote the arguably cult classic novel House of Leaves.
Leslie Nielsen is the well known actor. His older brother, Erik Nielsen, is a Canadian politician; the peak of his career was the period when he was the Deputy Prime Minister of Canada.
Raymond Massey, the actor, had a more famous older brother Vincent Massey, who was the first Canadian-born Governor-General of Canada.
Cleveland Amory was a journalist, best-selling author, and famous animal activist.
His brother, Robert Amory Jr., was a law professor at Harvard and Deputy Director of Intelligence of the CIA.
Andrew Lloyd Webber is a famous composer.
His brother Julian is a not-so-famous cellist. Damn good too.
Lawrence Durrell, novelist and Gerald Durrell, zoologist.
Shirley MacLaine and Warren Beatty?
Nancy Spungen was known as the girlfriend and murder victim of punk rocker Sid Vicious.
Her sister Susan is the founding editor of Martha Stewart’s Living magazine.
It don’t get much different than that!
Former porno actress Christy Canyon and writer/editor Carla Sinclair are sisters.
The remarkable family Stein: there’s Ep, and Gertrude and Ein, Ep’s sculptures are junk, Gert’s poems are bunk, and nobody understands Ein.