Why do I have a difficult relationship with my sibling?

Sibling relationships are governed by specific chart elements. Ba Zi examines the "Rob Wealth" (劫財) and "Friends" (比肩) elements — these govern sibling relationships; when they clash with your Day Master, sibling friction is natural. Zi Wei Dou Shu maps the Siblings Palace (兄弟宮) and examines the stars present. Western Astrology looks at the 3rd house (siblings and communication) and its ruler for sibling relationship dynamics. Jyotish examines the 3rd house (siblings) and Mars (competition and conflict) for sibling friction indicators.