Gus Dur and Megawati Apparently Brother?

In the dialogue on TV programs, who guided Garin Nugroho and Usi Karundeng, while serving as president, Gus Dur was asked about the deteriorating relationship with Megawati. Gus Dur was denied.
Because, he said, he and Megawati is still fairly close relatives. Why this is really new news. Where did the origin of your relationship is?
"Megawati's Bung Karno's son," said Gus Dur, of course everyone already knows. "Who's Bung Karno? He is a descendant of Raden Patah (First King' of Islamic Kingdom in Demak) Who am I alone? I am a descendant of Raden Patah's
brother" he added.
Of course, this statement makes the job of the historians of Indonesia, to check the truth of Gus Dur's info. A clear line of the National Awakening Party (PKB) itself really did not understand the particulars of blood relationship is Gus Dur and Megawati.
A character PKB, when asked by reporters at the Parliament House, raising hands confessed, "Well about this I do not know anything," and hurriedly walked away, worried that requested an explanation of his ignorance.