Understand the influence of birth order Learn from the shape of a family Between each birth, the family undergoes a reshaping. The experiences of a first child or an only child are very different from those of a youngest child with three siblings. Each person's position within the family affects the way he or she will think and act as an adult. This book explains how birth order afects the type of person you are, the type of spouse you choose, and the type of employer or employee you make. This updated, new edition includes: What effect your sex and the sex of your siblings has on your birth order characteristics; How understanding birth order can make you a better parent and partner.