It sounds like you're referring to the 1981 French film (released in English as "Stepfather" or "The Stepfather" ).
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Alternatively, maybe the user is referring to the Russian version of "Stepfather" from 1981. But I'm not sure if that exists. The original "Stepfather" is a well-known film directed by Adrian Lyne in 1987. There's also a French film with a similar title. The user might be confused due to the similar titles and years. They might have intended to ask about the 1987 American film but mentioned the wrong year. However, they specifically said 1981. Let me check that. It sounds like you're referring to the 1981
In her debut film role at age 15, Besse portrayed the precocious and determined stepdaughter. But I'm not sure if that exists