Your 15 year old son is showing signs of teenage depression. Over the last few months he has become plagued by feelings of worthlessness, making him extremely vulnerable to criticism, rejection, and failure.
Your teenage daughter is showing signs of anorexia. She will not eat in front of the family, she will only eat a few foods, especially those low in fat and calories, and more worryingly she appears to base her self-worth on body weight and body image. Further you have recently discovered a supply of laxatives in her bedroom.