PEOPLE can confirm that Mariah Carey’s mother Patricia and sister Alison died on the same day this past weekend.

“I am heartbroken that I lost my mother this past weekend. Sadly, in a tragic turn of events, my sister lost her life on the same day,” the Grammy-winning singer, 55, said in an exclusive statement to PEOPLE.

“I feel blessed that I was able to spend the last week with my mother before she passed,” Mariah added. “I appreciate everyone’s love and support and respect for my privacy during this impossible time.”

No other details are known at this time, including the cause of death of Patricia and Alison.

Patricia, who was previously married to Alfred Roy Carey, was a Juilliard-trained opera singer and vocal coach before the couple welcomed Alison, Mariah and son Morgan. The parents later divorced when the “Hero” singer was 3.

Mariah’s relationship with her mother, from whom she inherited her singing talents, was complicated throughout her life.

“Like so many aspects of my life, my journey with my mother has been full of contradictions and competing realities. It’s never just been black and white — it’s been a whole rainbow of emotions,” she wrote in her 2020 memoir, The Meaning of Mariah Carey.

“Our relationship is a thorny cord of pride, pain, shame, gratitude, jealousy, admiration and disappointment,” Mariah continued in the book. “A complicated love binds my heart to my mother’s.”

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Despite their ups and downs, Mariah maintained a relationship with her mother. In 2010, they reunited for ABC’s Mariah Carey: Merry Christmas to You special and performed a festive mother-daughter duet of “O Come All Ye Faithful/Hallelujah Chorus.”

Mariah also dedicated her memoir, in part, to Patricia. “And to Pat, my mother, who, despite everything, I think, actually did the best she could,” she wrote. “I will always love you the best I can.”

Mariah’s relationship with Alison was also quite complex. The star wrote in the memoir that, at least at that point, it was “emotionally and physically safer for me not to have contact” with either her or Morgan.