Deployed Soldier/Father needs your help

[SoldierDad]

Ok, just got off the phone with S12. He told me W let him have a sleepover last night with 2 friends. W told S12 that she had some things to do at work, and left. One of the friends father called every hour, checking on his son, who is also 12. At around 330 am, he came and picked up his son, when his son told him that my W wasn't there. My W didn't come home until 0800-0900. Now I am extremely pissed and hurt for that boy, and also that my W left them alone ALL night. I really need some advice on this, as I am so pissed, i don't want to do anything wrong. Thanks.