The Oscar-winner underwent treatment for throat cancer last month (Oct10) and has been photographed in recent weeks looking pale and gaunt.
But Douglas sent out a message of hope when he was pictured looking healthy and happy in a family shot at Disney World on Wednesday (24Nov10).
And now his dad Kirk has offered further encouragement the Wall Street star is on the mend - insisting his son has returned to his "feisty" self.
He says, "Michael is very good, I spoke to him yesterday. He's much stronger now - he's feisty."