The friends-starved Duke and Duchess of Sussex have infuriated former pals David and Victoria Beckham by forming an alliance with the British power couple's estranged son Brooklyn and his American heiress wife – and it's just one of the secrets behind the growing Beckham family feud, RadarOnline.com can reveal.

Critics tell us the battle royal is also Prince Harry and spouse Meghan Markle 's shot across the bow at his brother, Prince William , who has warmly embraced the Beckhams after their dramatic falling-out with the Sussexes.

"Victoria Beckham is probably saying, 'Why don’t they mind their own business? What do the Sussexes know about family?'" a Hollywood insider told RadarOnline.com , referring to Prince Harry and Markle's strained

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