My son sleep walks and pees ,were eva he wonts?

hi there my son is 7 ,and one night he wok me up he was in our bed room peeing on our wall,wich i found destubing ,any way went to c wat was up with him he was a sleep ,so i put him two bed ,cuple night on and he is peeing in the front shed of the house .now im happy for him to pee were eva he wonts ,but tonight ,i heard a noise ,it was the kitchen sick cuberd opening there my wonder full son was peeing in the cuberd ,,i said wat r u diong son ,,nothing he is sound a sleep ,,so i wok him up ,and look at me and smiled ,,and was embarest ,,but carred him to the toilet to finish ,and off to bed again ,,i havent herd of any of this kind of stuff in our family ,,wat do u think ,,thanks mike