Cailey Fleming as Michelle "Miki" Kaye (DOB: January 19, 1995)
Mia Isaac as Kelsey Grivogiannis (DOB: February 11, 1995)
Leah Lewis as Emma Yu (DOB: February 7, 1995)
India Fowler as Jacqueline "Jackie" Farrell (DOB: January 14, 1995)
Jon Bernthal as Gregory "Greg" Kaye, Miki's father (DOB: September 26, 1961)
Lyndsy Fonseca as Catherine "Katie" Campanelli-Kaye, Miki's mother (DOB: October 13, 1968)
Iddo Goldberg as James "Jim" Grivogiannis, Kelsey's father (DOB: March 24, 1962)
Ashley Madekwe as Stacey Nelson-Grivogiannis, Kelsey's mother (DOB: December 15, 1966)
Constance Wu as Dana Yu, Emma's single mother (DOB: August 31, 1965)
Michael Fassbender as Bradley "Brad" Farrell, Jackie's father (DOB: July 4, 1963)
Emilie de Ravin as Stacey Tanner-Farrell, Jackie's mother (DOB: September 9, 1970)
Caleb McLaughlin as Gregory "Greg" Rutherford (DOB: September 3, 1995)
Sadie Sink as Olivia "Liv" Smith (DOB: January 16, 1995)
Deva Cassell as Haley Davis (DOB: October 5, 1993)
Greta Onieogou as Mary Nelson, Kelsey's cousin (DOB: February 1, 1989)