Singer Madonna arrives at amfAR's Cinema Against AIDS 2008 event in Mougins during the 61th Cannes Film Festival in this May 22, 2008 file photo.[Agencies]

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Madonna's estranged brother says her daughter Lourdes will "rebel" by contacting him.

Christopher Ciccone, who has written a tell-all book entitled 'Life With My Sister Madonna', is not in contact with his sister's children - Lourdes, 11, seven-year-old Rocco and two-year-old adopted son David Banda - but is expecting Lourdes to get in touch when she is older.

He said: "I haven't seen them in quite some time. I have met Lourdes and Rocco, of course. I think when Lourdes is ready to rebel, she may call me."

Christopher, 47, does not believe his sister is set to divorce her film-director husband Guy Ritchie and claims the star will do whatever it takes to keep her family together.

He added to Britain's New! magazine: "I don't believe that they are in the process of getting divorced. They have a family and I believe they loved each other when they got married. I think they will do what they have to do to keep their marriage going."