Rean Tibeau

Born: unknown

Died: unknown

Real name: Dorothy Olive Tibeau (formerly Thibeault). 

Mother of actresses and singers Gina Gillespie and Dorothy Gillespie. Her third daughter, Mary Ann, appeared on The Mickey Mouse Club with her sisters singing.

Girls of the Big House (1945) as The Stool Pigeon (uncredited)

Identification from IMDB. Very little information is available. According to her daughter's YouTube channel this was Rean's only film.