Who is the oldest of the Van Dyke family?
Kelly Jean Van Dyke Kelly Jean Van Dyke (June 5, 1958 – November 17, 1991) was an American actress and adult film performer. She was the daughter of actor Jerry Van Dyke, niece of the actor Dick Van Dyke, and cousin once removed of Shane Van Dyke.
Elinor Donahue Mary Eleanor Donahue (born April 19, 1937), credited as Elinor Donahue, is an American actress, best remembered today for playing the role of Betty Anderson, the eldest child of Robert Young and Jane Wyatt, on the 1950s American sitcom "Father Knows Best".