Roy,
Will be praying for your grandson, I know he will come out fine, based on all the experiences I have had with my brood.
Last Christmas we had to extract my youngest from under the axle of a ford Excursion. Sledding acident, luckily he folded over like a card table when he was about to hit. so apart from leaving his blood, hair and some scalp on the axle he came out fine.
I am sure the good doctors will have him up and about and better then ever, before summer it will be like it never happened.
Back to the school work I put off all weekend.