As a step child, I am glad all my grandparents biological or not, never would have posted that they felt different about me than their biological grands. As a step mother I loved my steps as much and worked very hard to let them know that, I find some of this post rather sad.
If they had stayed longer we would be trying our best to help them out and I do feel very sorry for the boys. They have several health problems, will always be bigger than their age group, and they are not being taught basic life skills by their mother. I am afraid they are being set up for a hard time.