Helena is descended on her father 's side from John Bonham Carter , Member of Parliament for Portsmouth .
Bonham Carter 's paternal grandparents were British Liberal politicians Sir Maurice Bonham Carter and Lady Violet Bonham Carter .
Helena is descended on Bonham Carter 's father 's side from John Bonham Carter , Member of Parliament for Portsmouth .
Bonham Carter 's paternal grandparents were British Liberal politicians Sir Maurice Bonham Carter and Lady Violet Bonham Carter .