Madge's kids having sibling rivalry on MDNA tour

London, June 12 (ANI): Madonna has reportedly sparked serious sibling rivalry between two of her kids by letting them join her on the 86-date world tour.

The duo's constant attempts to out-do each other at the respective jobs assigned to them is causing the queen of pop massive headaches.

"Rocco and Lourdes have dev-eloped a really competitive spirit as they take up roles on their mum's tour," the Daily Star quoted a backstage source as saying.

"Lourdes is in charge of fashion and wardrobe and is responsible for picking outfits for at least 10 of the dancers. Rocco is doing a series of breakdances and singing on a few tracks. Between the two of them, they are constantly involved in one-upmanship," the source said.

Continuing further, the insider insisted that 53-year-old singer has taken an entourage of helpers for Lourdes, 15, and Rocco, 11.

"Mad-onna has taken an army of helpers along with her for the children, including five nannies and eight private tutors.

"The cost must be absolutely phen-omenal with their hotel bills, food and wages," the source claimed.

However, according to the source, it's not the pressure of performing the whopping 86 dates that's causing Madge, 53, to despair.

"It's all working out completely differently to how Madonna had hoped it would go and is creating family scenes.

"The kids are already causing her a massive headache and she had originally planned for her other two children David and Mercy to join them at some point.

"She's close to tearing her hair out." The source added. (ANI)