- She was one of the children hired to augment the children's singing voices in The Sound of Music (1965).
- In 1982, her two and a half year old son died of Aplastic Anemia, a rare blood disorder where the bone marrow does not produce the blood cells in the right numbers to provide immunity to infections.
- Younger sister of Charmian Carr and Shannon Farnon.
- Born on the same day as Duane Chase who co-starred with Darleen's sister Charmian Carr in The Sound of Music (1965).
- Daughter of actress Rita Oehmen and composer Brian Farnon.
- Niece of Dennis Farnon and Robert Farnon.
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