An adoptive father in Ohio who could spend the rest of his life in prison for raping three boys in his care pleaded guilty Thursday to another child rape charge and agreed to testify against a man he allegedly allowed to rape one of his adopted sons. The 40-year-old man, a long-time foster parent and youth basketball coach, pleaded guilty to one count each of child rape and complicity to rape in a Montgomery County court in Dayton. Under a plea agreement, prosecutors dropped five other charges against him in exchange for his testimony against a co-defendant. Sentencing was tentatively set for Feb. 26. The plea agreement calls for a total sentence of 50 years to life in prison