Firstborn children often have slightly higher IQs and complete more years of schooling than their younger siblings, but birth order accounts for no meaningful differences in personality.

Middle children occupy a special place in the sibling line-up, between the eldest and the youngest. Now a study reveals that they develop particular traits because of this.

The study used the HEXACO Personality Inventory to assess 6 personality traits based on sibling birth order: honesty-humility, emotionality, extraversion, agreeableness, conscientiousness, and ...

Sibling relationships are important. While friendships come and go, you’re stuck with your siblings. This relationship is oftentimes one of the longest relationships in a person’s life.

New research from BYU highlights how subtle parental preferences—based on birth order, personality, and gender—can shape sibling relationships and family dynamics. Siblings share a unique bond ...