Hello Arleen, and thanks for your question.
I'm sorry to hear that your grandson is experiencing this lack of interest in his schoolwork and is receiving failing grades. If he is also no longer interested in sports, I agree with the previous expert who has recommended having him seen by his Pediatrician and then referred to a mental health counselor, for example a psychologist who specializes in testing and treating children and adolescents.
It's important that he is tested for certain learning disabilities, such as Attention Deficit Disorder, Dyslexia, and others. His interest in school and failing grades may be due to a previously undiagnosed learning disability which causes him to struggle with the schoolwork, then become frustrated and take on an 'I don't care anymore' attitude.
As a teacher and a parent, I've seen many children held back in their school careers due to undiagnosed learning disabilities and once the cause of the problem was identified, the students were taught to learn in a different way that was suitable to them, and this lead to success.
I also agree that if he stated he wasn't depressed, I'm assuming this was in answer to a direct question from you or other family members, and he may not know what depression is/feels like, but if he's failing in school and has no interest in interacting with his peers in sports, the psychologist who evaluates him will let you know if he is depressed and/or is showing any warning signs of depression or drug use (of course, he should have blood work done at the Pediatrician's office, too).
Hopefully, you will find out the reason behind his present behavior and it will be treated in the most appropriate manner, so he can get back on track.
Please let me know if you need any additional information by clicking 'Reply
' and directing your response to me, 'Cher'.
Positive Feedback is always welcomed and greatly appreciated.