Barry Van Dyke is the second son of American actor Dick Van Dyke.
Barry Van Dyke -LRB- born July 31 , 1951 -RRB- is an American actor and the second son of actor and entertainer Dick Van Dyke plus he was the stepson of makeup artist Arlene Silver-Van Dyke and nephew of Jerry Van Dyke .. Dick Van Dyke. Dick Van Dyke. American. United States. Jerry Van Dyke. Jerry Van Dyke. He was best known to audiences as Lieutenant Detective Steve Sloan , a homicide detective and the son of Dr. Mark Sloan -LRB- played by Dick Van Dyke -RRB- on Diagnosis  : Murder .. Dick Van Dyke. Dick Van Dyke. Lieutenant Detective Steve Sloan. Lieutenant Detective Steve Sloan. Dr. Mark Sloan. Mark Sloan ( Diagnosis : Murder ). In the show , the characters ' relatives were frequently played by real-life family members .