Britney Spears' father has claimed that the 39-year-old pop star has dementia.Jamie Spears, 68, said his daughter had the condition on forms to justify controlling her finances - but fans insist it would be impossible for her to learn songs and routines if that were the case.The singer released a song on her 39th birthday in December, Swimming In The Stars, and has released four albums and been on four global tours during her father's 'conservatorship' – which gives a third party the right to manage someone's finances.It was set up when Britney's conduct deteriorated after her divorce from Kevin Federline in 2007, during which she lost custody of her children Jayden and Sean.But a documentary by journalist Mobeen Azhar, to be broadcast in.
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