Simplify the following text for a Grade 11 native English-speaking person.
Original: The voices of Kelly Generic ( Bobby 's sister ) and Martha Generic ( Bobby 's mom ) are based on two recurring characters Gail Matthius played when she was a cast member on Saturday Night Live in 1980 .
Simplified: The voices of Kelly Generic ( Bobby 's sister ) and Martha Generic ( Bobby 's mom ) are based on two characters Gail Matthius played when she was a member on Saturday Night Live in 1980 .