Madonna's brother Christopher Ciccone knows he will reunite with his superstar sister, but he's terrified it won't happen until the funeral of their beloved grandmother Elsie Fortin.

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Elsie, who is 99-years-old, helped raised Christopher and Madonna after their mother died when they were young.

Madonna's brother Christopher Ciccone has admitted that his superstar sister's obsession with younger men is in danger of becoming "creepy", RadarOnline.com is exclusively reporting.

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Ciccone -- who has not spoken to Madonna since he wrote a tell-all book, Life With My Sister Madonna, three years ago -- has been left bemused by her dating habits since her divorce from British director Guy Ritchie.