Beyonc�'s sister Solange lashed out at Jay Z because her multi-millionaire brother-in-law has reneged on repeated promises to help boost her music career, according to sources.
The 27-year-old singer - who is about to release her third album - was seen launching into an astonishing attack on music mogul Jay-Z at an after-party for the Met Gala.
And a family friend today revealed the simmering tensions that has led to the family feud, telling MailOnline: 'Solange is so angry because Jay-Z promised to give her more help with her career and when she brought it up again the night of the gala, he told her he just didn�t have the time to work with her in the studio.
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