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Older brother, David Nelson.
He is still alive and living in California
He is his brother in law, his wife's brother. Ricky Nelson was his brother-in-law, but he was married to Mark's older sister Kristen.
They were always very close.
Yes, he and his brother Matthew are the twin sons of Ricky Nelson.
She was his brother in law's wife.
The cast of Ricky Nelson Sings - 2005 includes: Steve Franken as Narrator Harriet Hilliard Kris Kristofferson as himself Ozzie Nelson David Nelson Tracy Nelson as herself Ricky Nelson as himself Matthew Nelson as himself Gunnar Nelson as himself
NFL receiver David Alan Nelson is 31 years old (born November 7, 1986).US musician David Nelson is 74 years old (born June 12, 1943).US actor David Nelson (older brother of Ricky) was 74 years old when he died on January 11, 2011 (birthdate: October 24, 1936).
I am assuming that you are referring to the sit-com The Adventures Of Ozzie & Harriett, which starred the late Ricky Nelson, his parents Ozzie & Harriett, & Ricky,s brother, David.
Kristen Harmon.
Gunnar Nelson is 49 years old (birthdate: September 20, 1967).He and twin brother Matthew are sons of the late Ricky Nelson.
Matthew Nelson is 49 years old (birthdate: September 20, 1967).He and twin brother Gunnar are sons of the late Ricky Nelson.