The answer is: Simeon and Levi

Gen 34:25-26

In the fascinating saga of Genesis, the tale of Jacob's family unfolds like a dramatic narrative filled with conflict and complex relationships, particularly after the incident involving Shechem. When Shechem, the son of Hamor, violated Dinah, Jacob’s daughter, the emotional whirlwind leaves her brothers, Simeon and Levi, with a deep sense of injustice.

Their reaction to the violation is one fueled by a mix of protectiveness and revenge. In an unusual twist, they cleverly devise a plan—offering Shechem and his father a way to seek forgiveness through circumcision, thus enabling them to integrate into the covenant community. Panic ensues as they recuperate from this painful procedure, and Simeon and Levi take ruthless advantage of their weakened state, launching a fierce attack and reclaiming their sister's honor. Such fierce loyalty is admirable, yet raises important ethical questions about justice and the means of achieving it.

Interestingly, both Simeon and Levi’s descendants later play significant roles in Israel's history, though their violent actions haunted them. For example, Moses, a descendant of Levi, initiated a transition from vengeance to law with the Torah's principles, showcasing how history can reflect on morality over time. Their lingering legacy forcefully opens discussions about familial loyalty and the extremes one might go to protect loved ones, poignant themes that resonate through biblical narrative.