That's because his heart is too empty, and his parents sometimes feel confused and helpless like children, so you should give him more psychological comfort and encouragement to help him get on the right track of life slowly, and never turn against him or anything, lest he give up more.

What family members fear most is giving up, so as long as you don't give up on him and keep warming him up, I believe he will always be moved by you, only a matter of time.