"Diana Barrymore (1921 – 1960) is the daughter of John Barrymore (1882 - 1942) and his second wife, Blanche Oelrichs, who writes poetry under the nom de plume of Michael Strange. The child's real name is Diana Blanche Barrymore Blythe - Blythe is the Barrymore's real cognomen. John's wit and noble rhetoric did not descend to his daughter. She has a nervous, quick intelligence, with a talent for pinning back a citizen's ears and a bad way of saying what she thinks, which is considerable."
Sadly, she died by her own hand in 1960 and you can read about that here.
CONFIDENTIAL MAGAZINE wrote about the real "Barrymore Brat" in 1954 - read it here.