Just days after the Reds centerfielder learned that his father Ken Sr. has prostate cancer and his mother Birdie would be undergoing surgery for colon cancer, a routine medical checkup Tuesday resulted in more bad news for Ken Griffey Jr., as doctors found a large malignant tumor on his right semitendinosus hamstring muscle. 'This is the rarest and deadliest form of hamstring cancer,' Reds trainer Mark Mann said. 'The only way to eradicate the cancer is to go in and slice the three hamstring muscles completely in half and permanently remove themas well as the three titanium screws holding them in placefrom his leg.' Next Wednesday, Griffey Jr. and Griffey Sr. are expected to become the first father-son duo to undergo chemotherapy together. 