"Defendant also forced Plaintiff to witness adults engaged in sexual acts with both adults and children during middle-of-the-night satanic worship meetings that included ritual sacrifices."
Alison, who previously worked as a prostitute and is HIV positive, claims in the papers that she has been diagnosed with post-traumatic stress disorder and depression as a result of the alleged abuse.
The lawsuit alleges: "As a result of the above Plaintiff has been diagnosed with post-traumatic stress disorder, anxiety and major depression, leading her to misuse both legal and illegal drugs in an attempt to suppress the horrific memories, and to undergo extensive professional counselling.
"Plaintiff now demands compensatory money damages for immense psychological and physical damage, mental pain and anguish and intentional infliction of severe emotion distress."
Mariah, 50, and Alison are estranged after falling out in 1991 and after Alison was arrested in 2016 for working as a prostitute, she recorded a video for The Daily Mail, in which she appealed to her famous sibling for help.
She said: "Mariah I love you, and I desperately need your help, please don't abandon me like this."