Favorite Child 1 (IMAGE) Brigham Young University Caption New research from BYU highlights how subtle parental preferences—based on birth order, personality, and gender—can shape sibling relationships and family dynamics. Credit Brooklynn Jarvis Kelson Usage Restrictions N/A License Original content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.