What does 1 Chronicles 7:21 mean?

Eleadah's son was Zabad, and Zabad's sons were Shuthelah, Ezer, and Elead. Some men from Gath, who were born there, killed Ezer and Elead because they tried to steal their livestock. 1 Chronicles 7:21 - Modern Text Bible

(This verse tells a brief story of tragedy in the family, showing that not all descendants had peaceful lives.)