By Daily Mail Reporter PUBLISHED: 08:42 EST, 4 October 2013 | UPDATED: 12:12 EST, 4 October 2013 Casey Kasem's children are being prevented from visiting their ailing father according to his daughter Kerri. Kasem, now 81, was known for his years as the host of the countdown show ‘American Top 40’. He is suffering from Parkinson's disease and retired from his radio hosting in 2009. Kerri, Mike and Julie Kasem say they have not been allowed to see their father for three months. Scroll down to hear a clip of Casey 'losing it'! Kerri, Mike and Julie Kasem say they have not been allowed to see their father Casey Kasem (right) for three months because of their step mother, Jean (left)
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Casey Kasem's longtime manager said the star is still of sound mind
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Kasem's children not being allowed to see father, says his daughter Kerri
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Kasem, 81, is suffering from Parkinson's disease
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Popular radio host best known as the voice behind 'American Top 40'
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Kasem had three children with his first wife and one with his current
The group held signs up with various messages imploring @placeholder to relent.