Praying for him, and I probably shouldn't say it, but I'm ANGRY. I've *never* heard of a doctor withholding antibiotics before for peritonitis because they wanted to see if it would resolve or whatever their idiotic reasons were. This has malpractice written ALL over it, and I hope Gabriel's parents know it.
Right now, you need to concentrate on getting him better, but while I don't know their financial situation, insurance, etc this second stay shouldn't cost them a PENNY. And that's at the least that should happen. You keep after them "grandma", because you were right...
Praying for him to completely recover and for pain relief and comfort.
Summerthyme