Sibling rivalry

right|thumb|Cain kills [[Abel, a fratricide illustrated by Gustave Doré ("And Cain talked with Abel his brother; and it came to pass, when they were in the field, that Cain rose up against Abel his brother and slew him.")]]

story in the Book of Genesis

Sororicide (; ) is the act of murdering one's own sister.

physical, emotional, and/or sexual abuse of one sibling by another

type of competition or animosity among siblings