They are not related
The two are completely un-related. Each starred as a U.S. President, but that's the only connection they have.
No
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...
Umm, no. Just bcause they have the same first name, doesn't mean their realted...