Can't  describe the pain I am going through and I am sure my DIL is going through worse.  She assures me that it is OK.  I know she is telling me that to calm me down.  I offered to help her like housekeep, cook meals for them, anything so she can have more time with g/daughter or perhaps catch up on sleep.  On her day off she would take g/daughter to summer school classes and do errands.  I have a feeling she did not want me in their house to avoid encounter with son or her mother.  The irony of it is my son seem to be handling everything like a breeze.  How did I raise a monster?  He's like a termite who ruined his own home.  
God, help me comprehend the situation.  How can this happen to a wonderful person like my DIL.  I was so thankful to you because my son found such a loving human being, respectful and an awesome mother to my g/daughter.  How much longer will we endure the pain?  Sorry for the many questions but I am so confused.  In the meantime please keep DIL strong healthwise and in spirit.  Lay your hands on her and shower her with love.  Thank you.