OP, I am very sorry this happened to you and your family. My partner and I and family have gone through similar. My SS was arrested via an internet sting several years ago and sent to prison. He was early 40’s at the time and has lost a good career, pension, his house, his future, his reputation, his family. The entire ordeal and the fallout have been devastating and we are still gutted.
We both went through depression and grieving the person we thought he was and the life and future he had, his place in our family, etc. There is anger, disgust, disappointment, sadness, even some pity for him for his ruined life and future,.
It is a difficult, painful, lonely, nightmarish situation to be in, but it does get better with time. Don’t allow yourself to be guilted into anything you don’t want to do, by anyone. If you want to support him, do. If you don’t, walk away without guilt. If you do, but with limits, enforce those limits as you need. He decided to commit a crime, now you get to decide what sort of relationship, if any, you want to maintain with him.