50 Cent, Curtis Jackson, has survived being shot at and beefs with some of the biggest artists in Hip Hop, but he recently told MTV he's currently in the "toughest" battle of his life.  The battle he's referring to is his child custody battle.  This battle has been heating up for some time and seems to have reached a new level when his son's mother accused him of setting a fire to his own in which she and his son, Marquis, lived in.  In a candid interview with MTV's Tim Kash, Fifty said, "I'd like to just see my baby." He went on to explain, "in the summertime, for the first two years I was successful, my son traveled with me those tours.  He was on the Roc The MIke Tour, he was on the Anger Management Tour.  This summer, when he's free, it, like no communication, it's tough."  During the interview he declined to speak negatively about his ex but when on to say, "this is the toughest (thing I've had to face), because he's my motivation."