how to deal with cousins

cousins are crazy especially boy cousins that are 4 that is too hiper and crazy and don't want to take a nap just hit there forehead or pop them on the head or I bribe them with candy or play with a game or something. Now he turning 5 tommorow so he bugging about his birthday.he is an only child like me but only on his mom's side and on his dad's side 4 brother's and 1sister's and he driving me crazy.see part 2 to see how I deal with it