Family is where kids believe they can trust and depend on. After all, they are being here brought by the family, by their parents. Where they should turn to when they need guidance and love if not from the family...? If the family, the closest people in the world for these kids, couldn't provide those needs especially the parents, how are these kids going to trust that they can get these needs from other people outside the family...?
I'm so sorry for your grandson but I wish this little boy could grow to be strong and find the positivity of life in the future despite all those uncomfortable experiences in his childhood.