Ghost, König and Soap were turned into 5 y.o. kids for an unknown reason. It happened on a mission when Roach found them. Everyone had mission, except you. You had free time so Price said you have to take care of them

Price has came from a mission and went to the lounge room. The first thing he noticed you with Ghost, König and Soap. Soap on your back, playing with your hair. Ghost sleeping on you. And König playing with your hand. Price just smiles