Since the days of Cain and Abel, sibling rivalries have dotted history in many shapes and forms. Some siblings sue each other over money or defamation, while others live out their days in a frigid silent treatment. Some sibling rivalries are purely playful, competitive one-upmanship. These sibling groups not only reveal that it’s impossible to expect brothers and sisters to get along all the time, they also show how some siblings simply have it in for one another. Here are seven of the most epic sibling rivalries of all time. Indian business tycoons Mukesh and Anil Ambani waged a war against each other in and out of court When Reliance Industries founder Dhirubhai Ambani died in 2002 without a will, his elder son, Mukesh , took over the company as chairman while his younger son, Anil, was made vice-chairman. Mukesh then reportedly tried to push Anil off the board, and tension between the siblings turned into an ugly legal battle, resulting in a demerger of the company led by the brothers’ mother in 2005. For the next five years the brothers continued to wage war against one another , both in and out of court, until their mother intervened again, this time issuing a non-compete agreement between the two in 2010. Though the brothers announced soon after that they were no longer feuding, new deals in the telecommunications industry could become a further source of competition for the Ambanis. Why Mukesh Ambani’s daughter Isha has everyone’s attention Sister singers LaVerne, Patty and Maxene Andrews had a decades-long feud Their careers were built on harmonising together, but the Andrews Sisters weren’t always as bright and cheery as their songs. Known for hits like Boogie Woogie Bugle Boy , the Andrews Sisters were the most successful female recording group in pop history, according to a 1987 Los Angeles Times article. So it’s strange – or maybe natural – that their success was clouded by a decades-long feud. All three sisters have been deceased since January 2013, but Maxene once chalked their intense loathing for one another up to too many years of working too closely together … though it may not have helped things that Patty joined another singing group in 1951 without telling her sisters. Despite their sweet image, Patty believed that their diehard fans didn't care about the feud at all, telling the LA Times , “When I start singing the Andrews Sisters songs, they don’t give a damn whether I talk to my sister or not.” 6 things to know about Akash Ambani, son of Asia’s richest man Jeppe Jarnit-Bjergso and Mikkel Borg Bjergso started a brewery together before their relationship soured Mikkel Borg Bjergso and Jeppe Jarnit-Bjergso have been making beer for years, and while they started out brewing together, they have since ventured out on their own. The identical twins each own their own beer outfit – Mikkel is the mastermind behind the brewery Mikkeller in Copenhagen while Jeppe runs the now-Queens-based Evil Twin Brewing – but the two have hardly spoken since 2010. The rivalry is clear; after all, each brother runs a business in the same industry, but the Bjergsos say they don't look at one another as competition – or at least, Mikkel doesn’t. “I don’t see Jeppe as a rival,” he told The New York Times’ Jonah Weiner in a 2014 article about the brothers’ love of beer and animosity towards each other. But Weiner makes it clear that, rivalry or not, there’s definitely a feud that the two brothers even tried to resolve with some couples-type counselling, but to no avail. Prestley and Curtis Blake of Friendly's fell out during one of many sales of the company Prestley and Curtis Blake opened Friendly's, a local ice cream shop in Springfield, Massachusetts, in 1935. Their double-dip, five-US cent ice cream cones were a success, and the business grew into a nationwide chain. 5 things to know about Nita Ambani, wife of Asia’s richest man The business sold multiple times over the years and the Blake brothers’ relationship remained intact, until the company decided to explore another sale in 2007. Curtis wrote to his older brother, who still held 13 per cent of Friendly’s, imploring him not to sell, but Prestley responded, through The Boston Globe , that he believed he was right and was going forward with the sale anyway. Curtis told the Globe he was disappointed that business had come between them, saying, “[Prestley] was my best friend for 85 years. It would have been a nice story if we ended up best friends for our entire life.” Curtis Blake died at his home in Florida in May 2019. The brothers had been close in recent years, despite the previous falling out. According to MassLive , Prestley said he had visited Curtis recently and “was very troubled to see his brother ill”. “We worked very closely for 43 years,” Pres Blake, who turns 105 in November this year, said. “I counted on him to make important decisions.” Mary and Anne Boleyn feuded over King Henry VIII’s affections. Sisters are often expected to share most things, whether they like it or not, but husbands? Mary Boleyn had a reputation for promiscuous behaviour and was known for being King Henry VIII’s lover until 1521, when she was married off to William Carey, a friend of the king. Her younger sister Anne was betrothed to an Irish cousin, but when the marriage fell through she set her sights on her sister’s old lover. After her marriage, Mary remained in the king’s court – all while Anne also resided there – spending six years trying to win King Henry VIII’s affections. Anne finally succeeded after the king broke away from the Catholic Church to marry her. She later gave birth to the future Queen Elizabeth I. She failed, however, to produce a male heir, weakening her relationship with the king and threatening her place of power. Anne was executed after she was accused of committing adultery and incest with her brother, along with conspiring against the king. She is largely credited with being the catalyst for the formation of the Church of England, despite her untimely end. Beyoncé to sing at wedding of Indian billionaire Mukesh Ambani’s daughter Christopher is one of seven of Madonna's siblings – and according to The Guardian , there’s tension between the pop star and her brother Anthony as well Christopher Ciccone and Madonna stopped speaking before his memoir, Life With My Sister Madonna , was released. Madonna and her brother Christopher Ciccone worked pretty closely together throughout her career – he had been her assistant, stylist and artistic director at one time or another – but the two stopped speaking right before his 2008 memoir hit shelves. The book details intimate information about Madonna’s ex-husband, children and career, among other things that didn’t sit too well with the “Material Girl”. Indian business magnate Mukesh Ambani topples Jack Ma as Asia’s richest person Madonna and Christopher continued not speaking for another five or six years, but reportedly were “back to being brother and sister”, Christopher told The Huffington Post in 2012. However, in 2017, the feud was reignited after Christopher claimed Madonna had “blacklisted” him from Hollywood, calling her “horrific”. Cleopatra is said to have had a hand in the deaths of three of her siblings Cleopatra is largely remembered for her beauty and intelligence, as well as her sometimes ruthless nature. According to History.com, Cleopatra may have had a hand in the death of three of her siblings, likely to secure her own power and place as ruler of Ancient Egypt. Her husband (and sibling!) Ptolemy XIII, exiled her from Egypt after she attempted to claim the throne as Egypt’s sole ruler. She then, with Julius Caesar, went to war against her brother. He died by drowning in the River Nile after being defeated in battle. 5 young celebs who don’t conform to traditional gender roles Cleopatra then remarried her younger brother Ptolemy XIV. However, she then supposedly had him murdered to make her son her co-ruler. It is also said that she orchestrated the execution of her sister, Arsinoe, who she deemed to be a threat to her and her throne. A sibling rivalry is one thing, but Cleopatra’s feuds with her siblings ended in bloodshed. Want more stories like this? Sign up here . Follow STYLE on Facebook , Instagram , YouTube and Twitter This article originally appeared on Business Insider .