How old is your grandson and how big is the quilt? Could it still be a quilt for dragging around and making forts out of--something he could still enjoy? Just a thought, if it is too discouraging to try to take out all of the quilting. Then go on to the next project and learn from this one (and all of the great advice everyone has given). I had to take out the quilting on a quilt for my husband because of a pleat in the middle of the back. I had used t-shirts that could not be replaced, so no choice. The needle holes did not show after I laundered it. Good luck and welcome to the club AND don't give up!