The psychology of brother-sister relationships is also marked by a complex interplay of love, loyalty, and rivalry. Brothers and sisters often experience a range of emotions, from affection and protectiveness to jealousy and competition. These feelings can be intensified by factors such as birth order, family dynamics, and individual personalities. For instance, a younger sister may look up to her older brother as a role model, while an older brother may feel protective of his younger sister. These dynamics can influence how siblings interact with each other and, subsequently, how they navigate romantic relationships.