Yes, the Bee Gees brothers are not Australian. The Gibb brothers were born on the Isle of Man(Britain) to English parents and lived in father Hugh Gibb's birthplace of Chorlton-cum-Hardy, Greater Manchester, England.

They are originally British and gained their fame after their family relocated to Redcliffe in Queensland, Australia's Moreton Bay Region, and eventually to Cribb Island.

The brother first created the Rattlesnakes, a skiffle/rock and roll band, in England in 1955. The Rattlesnakes were a skiffle/rock-and-roll band comprised of Barry Gibb on guitar and vocals, Robin Gibb, and Maurice Gibb on vocals.

Early Bee Gees. More people need to become familiar with this time period. Yes they did exist before the 70's. Long before.#beegees ❤ https://t.co/1iOvG7oeg0

— Robin (@1RobinAnn) June 1, 2022

Furthermore, their buddies Paul Frost was on drums and Kenny Horrocks on tea-chest bass. The lads began singing in harmony in December 1957. 

They were planning to lip-sync to a record in the nearby Gaumont cinema, but the fragile shellac 78-RPM record broke as they were racing to the theatre.

The brothers had to perform live, but the audience responded so positively that they decided to pursue a singing career. When Frost and Horrocks departed the Rattlesnakes in May 1958, the Gibb brothers established Wee Johnny Hayes and the Blue Cats, with Barry as "Johnny Hayes." 

The Gibb family, which included elder sister Lesley and newborn brother Andy (born in March 1958), immigrated to Australia in August 1958 and settled in Redcliffe, Queensland, about northeast of Brisbane.

To make ends meet, the young brothers began performing. Bill Goode, a speedway promoter and driver, introduced the brothers to Brisbane radio-presenter jockey Bill Gates after hiring them to amuse the crowd at the Redcliffe Speedway in 1960.

The fans at the track would toss money onto the track for the guys. And Gates dubbed them the "BGs" (later altered to "Bee Gees") from his, Goode's, and Barry Gibb's initials.

Each year, the three issued two or three singles, with Barry supplying extra tunes to other Australian performers. The Bee Gees were picked as the opening act for Chubby Checker's concert at Sydney Stadium in 1962.

The Bee Gees had 19 UK top 10 singles, including five number ones, during their career.

'Stayin' Alive,' 'Night Fever,' 'How Deep Is Your Love,' 'Tragedy,' 'More Than a Woman,' 'Massachusetts,' 'You Win Again,' and 'Jive Talkin' are among their numerous singles.

The Bee Gees have sold over 220 million albums worldwide. Many other musicians' hits were written by Barry Gibb and his siblings.

These include Frankie Valli's 'Grease' from the film of the same name, Barbra Streisand's 'Woman in Love,' Samantha Sang's 'Emotion,' Yvonne Elliman's 'If I Can't Have You,' Dionne Warwick's 'Heartbreaker,' and Kenny Rogers and Dolly Parton's 'Islands in the Stream.'

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Unfortunately, among,  Barry, Robin, and Maurice Gibb, Barry Gibb, is the last remaining member of the Bee Gees. Robin and Maurice, his younger brothers, died in 2012 and 2003, respectively.

The eldest Gibb is now 75 years old and has continued to compose music after the deaths of his siblings and comrades.

Maurice Gibb, 53, died abruptly of a heart attack on January 12, 2003, while awaiting emergency surgery to repair a strangulated bowel. Initially, his surviving brothers stated that they meant to keep the name "Bee Gees" in his honor.

Hey everyone, I’m so happy to share this album with all of you! #Greenfields is filled with some of my favorite songs and recorded alongside some incredible people. I hope you enjoy the album as much as I enjoyed recording it. Listen here: https://t.co/w32i7HwSDe pic.twitter.com/encu4zQoiP

— Barry Gibb (@GibbBarry) April 5, 2021

Robin's solo album Magnet was released the same week Maurice died. The Bee Gees earned the Grammy Legend Accolade on February 23, 2003, making them the first recipients of the award in the twenty-first century.

In a sorrowful ceremony, Barry and Robin accepted, as did Maurice's son, Adam.

But as time passed, they opted to retire the moniker, allowing it to symbolize the three brothers collectively.

On November 20, 2011, it was revealed that Robin Gibb, 61, was diagnosed with liver cancer. On 14 April 2012, it was announced that Robin had pneumonia and was in a coma at a Chelsea hospital.  

Although he awoke from his coma on April 20, 2012, his condition swiftly deteriorated, and he died on May 20, 2012, of liver and renal failure.

However, Barry Gibb continues to release songs as a solo artist. Greenfields: The Gibb Brothers' Songbook (Vol. 1), his most recent album, was released in January 2021.

It features country-inspired interpretations of iconic Bee Gees songs done as duets with other music legends like Dolly Parton and Keith Urban.

Hugh and Barbara Gibb, Barry's parents, had five children. Along with Robin, Maurice, and Barry, the youngest Gibb brother, Andy, was also a musician who died of myocarditis in 1988 at the age of 30. And Lesley, who chose a peaceful life following a brief spell with the Bee Gees.

Lesley, the oldest sibling, and the only girl joined the band in the 1960s, while Robin was focusing on his solo career.

Originally known as The Rattlesnakes, the British Bee Gees brothers found popularity as the Bee Gees in Australia in the late 1950s and early 1960s.

According to Wikipedia, the brother has had a successful career over the years with a net worth of over $200million. Several awards and honors were bestowed upon them.

The Bee Gees were honored with a star on the Hollywood Walk of Fame in 1979. They were the focus of Michael Aspel's This Is Your Life in 1991, while they were being interviewed by disc jockey Steve Wright (DJ) on his Radio 1 show at BBC Broadcasting House.

The Bee Gees were admitted into the Songwriters Hall of Fame in 1994, the Artists Hall of Fame in Florida in 1995, and the ARIA Hall of Fame in 1997.

In 1997, the trio was inducted into the Rock and Roll Hall of Fame. The award was presented by Brian Wilson, the historical leader of the Beach Boys, another "family act" with three harmonizing brothers. They were inducted into the Vocal Group Hall of Fame in 2001.

Details about several other awards can be found on Wikipedia.

Barry Gibb has a net worth of $140 million as a successful singer, composer, and producer. Similarly, Maurice had an estimated worth of $100 million.

The Bee Gees are one of the most popular musical groups of all time, with over 220 million records sold. 

They were nominated for 14 Grammys in all, winning nine of them.