- Helaine is the daughter of film/television actor and teacher, Harvey Lembeck. She is also the sister of actor/director Michael Lembeck. Helaine and Michael teach comedy acting at "The Harvey Lembeck Comedy Workshop" in Los Angeles, which was founded by their father. Their students are a "who's who" of successful sitcom actors including John Ritter, Robin Williams, John Larroquette, Lenny Clarke, and many others.
- Sister-in-law of actress Lorna Patterson.
- Ex-sister-in-law of Barbara Deutsch.
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