Legendary U.S. radio personality Casey Kasem's children have issued a final ultimatum to their father's wife in a bid to visit the Dj as he battles Parkinson's disease.

Kasem's family have recently been locked in a bitter feud as his wife Jean has reportedly blocked his three children, Kerri, Julie and Mike, from visiting their ailing father for three months.

It has now emerged the children have given Jean one week to let them see their dad or they will go to court to ask a judge to file conservatorship papers to place Kasem under their care, according to Tmz.com.

Cops were called to the star's Los Angeles home on Tuesday (01Oct13) after the children, along with friends and co-workers, camped outside the property to protest against the lockout.