What an absolutely terrible situation, hearbreaking. I normally hate confrontation and very often won't stand up for myself, but when it comes to children or animals being ill-treated, I'm a real hot-head. I'm raging on your behalf - no matter how frightened of your son you are, you must inform your ex-DIL immediately of your concerns and follow through with reporting him to SS. My God if it was my son, who I love dearly, I wouldn't hesitate in taking the child's side, even if it meant alienating my son; I would be wanting to take the child back to my house and locking the door, such is the strength of my feelings (not very helpful I know and I'm not for one moment suggesting you do this). And don't worry about access, a friend of mine was denied access to her GD - her son, the father of the child - had split up from the mother who just decided to deny access to the father and his family. She took the mother to court and she and her son have now been granted very generous access. Your son is an adult with all the power, his daughter is a defenceless, innocent child; you can stand up to your son, (you have to) your GD cannot. You have made the first move to step in and put a stop to this abuse, well done, please carry on and do all you can to get your GD away from her bully of a father.