The deejay's health care and visitation rights has been at the center of a legal tussle between his children from his first marriage - Kerri, Julie and Mike - and his second wife, Jean Kasem, with whom he has one child, Liberty.
Kasem was admitted to a Washington state hospital earlier this week in critical condition, suffering from an infected bed sore. Deraney said the deejay's health was declining on Friday.
"If he opens his eyes, I want my Dad just once to see everyone standing around him, putting our differences aside and let him know how much he is loved by everyone, including Jean and Liberty," Kerri Kasem said in a statement.
Kasem, most famous for his weekly top 40 countdown radio show and as the voice of Shaggy on the "Scooby-Doo" cartoons, suffers from Lewy body disease, a form of dementia with symptoms similar to Parkinson's disease and hallucinations.
The legal battle between the deejay's family members escalated earlier in May when Kerri Kasem and her sister filed court papers saying that they did not know his whereabouts.