- Uncle of Oliver Hudson and Kate Hudson.
- Ex-brother-in-law of Goldie Hawn and Cindy Williams.
- Middle brother of Bill Hudson and Brett Hudson.
- Has a daughter: Sarah Hudson (b. March 24, 1980) with ex-wife, Wendy Gotelee.
- Uncle-in-law of Erinn Bartlett and Chris Robinson.
- Mark, Bill and Brett worked with uncle Keenan Wynn on the 1982 movie, "Hysterical". Ironically, ex-sister-in-law Goldie Hawn's long-time partner Kurt Russell starred on two TV series in which Keenan guest-starred: "The Travels of Jaimie McPheeters" (1964) and "The Quest" (1976).
- Great-nephew of comedian and actor Ed Wynn.
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