The answer is: 70

Judges 8:30

Gideon, also known as Jerubbaal, was a fascinating figure in the Book of Judges, prominently acting against the Midianite oppressors. His familial legacy—70 sons—is a notable detail that reflects both the blessings and challenges of his era. In ancient Israel, having many sons was a sign of prosperity and divine favor, while also serving as a measure of one's capabilities in dealing with inter-tribal relationships and threats. Gideon’s impressive lineage can be seen as a symbolof his strong leadership and the stability he once brought to Israel.

Interestingly, within Gideon's story, we see a twist that highlights the complexities of human nature and legacy. Most appallingly, Gideon also had a concubine in Shechem who bore him another son named Abimelech. This relationship and its consequences speak to the intricacies of societal norms in that time, especially concerning familial relationships and the inheritor's rise. Abimelech's later actions echo with tragedy, eventually leading to a violent power struggle after Gideon's death, showcasing the cycle of violence and disunity common in the period of the Judges.

Beyond just recounting genealogies or showing divine favor in numerical terms, the narrative encourages us to ponder what it means to refine one's legacy amidst human flaws. Gideon's life serves as a cautionary tale about leadership and family—how the choices we make can have lasting impacts that stretch well beyond our own lives.