Rachel Dolezal
Rachel Dolezal says she 'identifies' as African American Rachel Dolezal: Facebook

The strange saga of the white woman who has lived as an African American has taken yet another twist with the revelation that her biological brother is facing charges of sexually abusing a black child in their childhood home — quite possibly Rachel Dolezal's adopted black little sister.

The charges indicate that Donezal herself may also have been a victim of abuse.

The case against Joshua Dolezal, 39, might be the reason Rachel's parents "outed" her as a white woman because she has stood behind her little sister, while her parents have implied she helped orchestrate the charges against their son, reports the Washington Post.

Rachel resigned Monday as head of the Spokane NAACP in Washington but said she still insists she "identifies" as being black.

Joshua is contesting the charges against him and is free on a $15,000 (£9,467) bail while awaiting trial, according to the Denver Post.

The alleged incidents of sexual assault occurred at Lawrence and Ruthanne Dolezal's house in Colorado in 2001 or 2002. The victim, whose name was redacted, was 6 or 7 years old, and Joshua Dolezal was 19 years older and in a "position of trust" with the girl, according to a Clear Creek County affidavit in support of an arrest warrant obtained by the New York Daily News. The abuse included alleged incidents of oral sex, according to the court records. Joshua Dolezal wasn't charged until years later in 2013 because the alleged victim said she was worried about Dolezal's new baby daughter.

In legal documents related to the case, the alleged victim's older sister (her name is redacted but Esther's only sister was Rachel) also talks of being sexually abused by Joshua and being shown photos by him of topless black women in issues of the National Geographic because her brother was "turned on" by the black body, reports TMZ.

Rachel and Joshua are the only biological siblings in the Dolezal household. The parents also adopted four black children. Rachel has won custody of one of them, Izaiah, whom she treats as her son. Her little sister, now 20, is Esther. Both Izaiah and Esther have spoken out in support of Rachel.

"I fully support my sister," Esther Dolezal has written on her blog. "For something that is making a difference, someone that is making positive changes in this messed up world, why would someone want to stop the good work they are doing?"