Sybil at Sixteen is the fourth of the quintet of books on the Sebastian family. Other closely related titles in the series are: Evvie at Sixteen, Thea at Sixteen, Claire at Sixteen, and Meg at Sixteen. According to a critic writing in Publishers' Weekly, through this series of novels "the Sebastians have established themselves as a family to watch." Each book takes off from the events surrounding the sixteenth birthday celebration of a family member. In the first four books, the sixteenth birthday celebration is in honor of one of the Sebastian sisters. The last book in the series is the sixteenth birthday celebration of Meg, the mother, at which she fell in love with and later married Nick Sebastian, father of the sisters.

While Sybil at Sixteen is enjoyable in and of itself, a deeper understanding of the family is possible through reading the related...