Rosalie was the daughter of Sarah Ann Maccaw and Charles Henri Poulain duBignon.

At the time of her birth, Henri was married to another woman, but, while keeping his wife pregnant every year, his eye started to wander and he ended up fathering dozens of children with various women.

Sarah (Maccaw) Aust was helping with the children in Henri's home because her first husband had died and she was far from home and her only family was a bachelor cousin, William Dover Jenkins who was living in western Glynn County out near Henri's wife's family, the Nicolau brothers.

Sarah was first married to George Butler Aust and, just like her penchant for married men, he too was currently married when they wed. They immediately fled England after their nuptials and came straight to Glynn County. George barely lived ten more years, leaving Sarah with three mouths to feed; therefore, she sought employment with the duBignon family on Jekyll Island.

Over the years, she had three more children, all born of Henri duBignon and she long-held the belief that she would be the next Mrs. duBignon should his wife die, which, happened in 1850.

But, her dreams were crushed when it turned out that her own daughter (born of George Aust) was 3 months pregnant and the father was her lover, Henri. I like to believe Sarah stepped aside so that her daughter would not be scorned by society as she was, and thus, her daughter married Henri in 1852 and Sarah married Willis Reddick in 1867 and promptly left Glynn County to live with her daughter, Rosalie, in Jacksonville, Duval County, Florida.

Henri died in 1866 and it is believed that he was interred on the Burnett Plantation and it was rumored that Sarah wrote a letter to one of her children expressing her desire to be buried beside her one true love, Henri. However no one knows when Sarah died and the cemetery at Highland Park in Glynn County, was long since destroyed by a land developer; the stones were pushed off into the marsh per local lore.