Idols Junior Grade

Scheduled to go before the cameras soon is a Frank Sinatra Enterprises epic obligingly titled (in return for a Pepsi-Cola national publicity plug) For Those Who Think Young. The stars are Sinatra and Martin--not Frankie and Dean, oddly, but a pair called Nancy and Claudia. Nancy is 23, Claudia 19, and the very thought of their names in lights makes the whole Clan feel old.

A lot of other Hollywood citizens have reason to feel old this season.

Suddenly the desks of casting directors seem awash with the names of celebrities' kids bent on making their own names. Some of them have genuine talent, some are riding on a parental reputation built 30 years ago. But because of who their mothers or daddies were, all of them get a hearing--and some may even be heard from. Among the more promising:

>> Bronwyn FitzSimons, 19, looks markedly the way her mother, Maureen O'Hara, did 20 years ago. Bronwyn has five television credits and one film (Spencer's Mountain) behind her, is currently interested in a singing career. She has the sure instinct of the Hollywood child for PR-Man's English: "I sing, I dance, I'm starting a record company. I act, I work in an office, I golf. I'm a refined cut-up."

>> Jim Mitchum, 22, has progressed through bit parts to star billing in Carl Foreman's The Victors. He is a heavy-lidded, torpid replica of Actor Robert Mitchum, but with little of his father's suggestion of latent energy and smoldering violence.

>> Julie Payne, 23, daughter of Actor John Payne, professes to look on the movie industry as one long bitter pill, but after going through five drama coaches, has turned in a creditable performance in The Best of Everything.

>> Frank Sinatra Jr. has gone summer-touring with the Tommy Dorsey band, and with his nasal intonation and easy delivery almost convinces listeners that they are back at the Paramount Theater, circa 1940.

>> Anna Massey, 25, Raymond's hazel-eyed daughter, won rave reviews in the London production of The Miracle Worker, added to her reputation in the Gielgud-Richardson School for Scandal, is now starred in a revival of The Doctor's Dilemma. Equally talented is her brother Daniel, 29, whose wit and whimsy set the fairy-tale mood of Broadway's airy musical She Loves Me.

>> Liza Minnelli, 17, daughter of Judy Garland, displayed a familiar, huskily tremulous voice and an engagingly energetic style in the off-Broadway revival of Best Foot Forward, was promptly signed to a record contract and offered her pick of parts in several films and half a dozen future Broadway musicals.

>>Danny Milland, 23, is launching a television career with his first bit parts. He is a towering 6 ft. 6 in. Says his father Ray: "They're going to have to dig a trench hole for him whenever he's got a short leading lady."

>> Mario Thomas, 23, daughter of Comedian Danny Thomas, "started out to be quite normal and almost made it," but eventually turned from English teaching to a starring part in the Hollywood Civic Playhouse's Sunday in New York.

>> Maureen Reagan, 21, daughter of Ronald Reagan and Jane Wyman, will shortly make her screen debut in something called Hootenanny Hoot.

>> Tracy Wynn, 18, belongs with his brother Ned, 22, to the third generation of stage-struck Wynns (preceded by Father Keenan and Grandfather Ed). Tracy has his first stage role this summer (in San Diego's La Jolla Playhouse dramatization of Tom Sawyer), but he never had much doubt about his career. When his interest occasionally wandered from the theater, he recalls, his mother would "remind me that we were a theatrical family and that that's where I ought to be."

>> Robin Corey, 18, is a brown-haired beauty who recently made her TV debut on Father Wendell Corey's Eleventh Hour show.

>> Geraldine Chaplin, 18, ballerina daughter of Charlie Chaplin and Oona O'Neill, plans a professional career, has danced before the Queen Mother.

>> Monika Henreid, 20, daughter of Actor-Director Paul Henreid, has appeared as a cocktail lounge singer and in several television shows, will soon appear in her father's forthcoming Dead Ringer (with Bette Davis and Karl Maiden). Her father once made an evaluation of her talents that stands as a classic of celebrity kinsmanship. "I think she is enormously talented," he said, wooden-faced. "I don't say that because I'm her father."

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