No way... but he died. But he's the only one who i know thats a 20th century boy. Mon-chan. But wait a minute, it was sadakiyo who killed him so theres no proof that he died, but even still how would he survive his disease or was that all a lie?
And I still dont see how kana is fukubei's child. She has brown hair, but fukubei has black. Maybe it was caused by him tampering with her birth.