That is a very difficult situation to be in. Do you happen to know a teacher or coach at the high school? Maybe they can do the same for S16…..if counseling is recommended by one of them, maybe he will be required to have at least one session. I wish I had better advice for you. I will keep trying to think of something that you can do anonymously that may help.
Thornton's idea of asking S13's counselor may work, too. He/She could call the other school and recommend it just because they are siblings and S13 may mention something in counseling that "triggers" that call. Usually, the counselors in the same school districts know each other from teacher training or recommending kids going into the next school.
Keep us posted - I hope S13 gets the counseling very quickly. Will be thinking of you and your sons.
M 44 H 46 M 20yrs T 25 yrs S15 S12
ILYBINILWY 7/18/15 Move to MBR 9/8/15 Physical Separation 10/10/15 Suspect A 8/2015 Confirm A 12/27/15 D filed by H 2/2/16