C.B.
I responded to your post the other day on this subject and I did advise that he might be suffering from shy bowel. I don't know that there is an age limit on that so I'd say yes, he could have shy bowel.
It REALLY looks like you want someone to say no so you can blame his mother for something. I'm sorry you don't seem to like her or her parenting style, but she is the child's mother.
And I believe you are posting about your grandson, not your son, right?
I don't believe that you want her in his life; everything else you post belies that sentiment.