Both were from Manchester and travelling in a Vauxhall Corsa at the time of the crash with a Ford Fiesta.
Mariah’s family said their daughter “had so much to live for” and are “shattered” after losing her.
They said they “can’t begin to explain how heartbroken we are as her parents” after losing their “beautiful baby” who was “full of life”.
They said: “As mother and father we are shattered and feel helpless but pray that our beautiful girl is at peace and have no choice but to accept this was the will of god. Mummy and daddy love you, Mariah. Until we meet again, my princess.”
The family of 13-year-old Kiara, also from Manchester, said she was a “very smart girl, wise beyond her years”.
They said: “Her smile could light up the darkest rooms. She was very outgoing and had lots and lots of friends.
“We will miss her infectious smile. Her cheekiness would drive us mad but also make us happy at the same time. We are at a loss at what to do. We are heartbroken and will miss our beautiful Kiara eternally.”
Two other passengers of the Vauxhall Corsa, a 21-year-old woman and a 14-year-old boy were taken to hospital to be treated for their injuries which are not believed to be life-threatening.
The driver of the Vauxhall Corsa, an 18-year-old man from Cheadle, was arrested on suspicion of causing death by dangerous driving. He was bailed pending further enquiries.
The driver of the Ford Fiesta, a 20-year-old woman, sustained minor injuries and was taken to hospital for further checks. Her injuries are not believed to be life-threatening.