Oliver Caldwell (played by Gregory Harrison) is a protagonist in Au Pair.
Wealthy widower businessman and father of two, falls in love with his au pair. Jennifer Morgan (played by Heidi Lenhart) is a protagonist in Au Pair.
American au pair who becomes engaged to Oliver, navigating family and business challenges. Nigel Kent (played by John Rhys-Davies) appears in Au Pair.
Oliver's business associate or friend, provides support during corporate and personal challenges. Katie Caldwell (played by Katie Volding) appears in Au Pair.
Oliver's daughter, deals with changing family dynamics and supports her parents' engagement. Charlie Cruikshank (played by Michael Woolson) appears in Au Pair.
Friend or colleague of the Caldwell family, offers comic relief and social support. Alex Caldwell (played by Jake Dinwiddie) appears in Au Pair.
Oliver's young son, adapts to his father's new relationship and faces corporate intrigue. Sam Morgan (played by Richard Riehle) appears in Au Pair.
Jennifer's brother or relative, provides family background context in the sequel.