Mariah Carey's Estranged Sister Sues Her for Emotional Distress

Mariah Carey's estranged sister says she's suffered emotional distress from the singer's allegations about her ... so she's suing her for at least $1.25 million.

Alison Carey claims in new legal docs obtained by TMZ ... Mariah presented no evidence to back up the accusations of abuse in her 2020 book, "The Meaning of Mariah."