A.S.
K.,
unfortunately, with bed wetting, there isn't anything you can do except let the boys grow out of it. I know from my personal experience. Something you might try, limit their drink about an hour and a half before they go to bed. that will give the drink enough time to work its way thru their system before bed. At about the age of 15 or 16, they should learn to control it. I know its frustrating for you and for them. If they want to stay at friends' house, maybe you can talk them into wearing the good nights or something similar to hide the problem. Believe me, if their friends find out, it will make the child feel worse than having to wear the good nites.
Hope this helps.