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First one is Nathaniel, then Grayson with his twin sister, Chase, another sister and Bliss, the only omega son. Nathaniel and Bliss also have their own stories in novel version: "Run if you can" and "Deflower me if you can".

The Miller siblings are: Nathaniel, the older one, a dominant alpha, his story is titled Run Away If You Can, and his partner is Chrissy Jin, a beta;
Grayson and Stacy, twin siblings who are both dominant alphas;
Chase;
Larien, a dominant alpha woman;
Bliss, a man and the family's only dominant omega—his story is titled Deflower Me If You Can, and his partner is Cassian, a beta.