Kirk Douglas is 5'8"; Micheal Douglas is 5'10"In Spartacus, Kirk wore 3" elevator sandles at the bequest of Director Stanley Kubrick. Some of the ground-level close-ups didn't even attempt to hide...
Yes, he has. His son's name is Dylan Michael and his mother is Catherine Zeta Jones. Michael Douglas has also a son from his first marriage but I don't know his name.