Who is the oldest of the Van Dyke family?
Jerry Van Dyke Jerry Van Dyke (born July 27, 1931) is an American comedian and actor, the younger brother of Dick 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".