You can forget all that jazz about brothers and sisters not getting along with each other, especially in the case of Paul and Patty Petersen. Paul and Patty practice togetherness at home and at work.

Home is in Sherman Oaks, Calif., with their parents. Work is ABC's "Donna Reed Show," where they portray Donna's offspring.

Psychiatrists would find it difficult to isolate any neurosis in the Petersen family. There are no conflicting careers or jealousies when a 9-year-old and 17-year-old are employed on the same job. Mr. and Mrs. Petersen, naturally, are the first to applaud the arrangement.

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