The worried father of a 13-year boy who disappeared more than a month ago in a possible attempt to survive “off the grid” plans to mortgage his home in order to offer a cash reward for his safe return.

William Yoblonski, of Reedsburg, is offering a $10,000 reward for tips that bring his son, James Yoblonski, home after the child ran away on June 12 and hasn’t been seen or heard from since, he told WiscNews Monday.