Help 7 yr old problems?

My son and wife were showering and he was masterbating he said it felt grate and his mom was suking it and said her vagina tasted like fish and now wen i get home from work shes having sex with him my wife gets turned on very very very easily just by looking at it it makes her want to have sex with that person and yes me and my wife have sex 3 times a day at night 2 times and in the morining