According to the story line for Nanny and the Professor, Doremus is the oldest of three children of widowed college professor Harold Everett (played by Richard Long), who hired Phoebe Figalilly (Juliet Mills) as housekeeper and nanny.
McCullough's first appearance was as a 7-month-old baby in a diaper commercial, co-starring with actress Juliet Mills.
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An ABC Movie of the Week and a sequel to The Letters (1973), the film is co-produced by Aaron Spelling, written by Ann Marcus and stars Martin Sheen, Belinda Montgomery, Robert Sterling, June Allyson, Ken Berry and Juliet Mills, among others.
In the final episode, Timmy's hand is seen reaching out to Tabitha and in the closing sequence with all the cast waving goodbye, Juliet Mills holds his portrait while the song Auld Lang Syne sung by Evans from the first season of Passions plays.