Need help with dispute please!

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My son came home from school today, citing that he was pushed down by his "friend", after further questioning, he also said that he was pulling "fake punches" over the last 2 weeks and although being playful, hit him one time. My son has asked him not to act this way...that they are both in Karate, and that any act of aggression such as this is forbidden. Come to find out, my little boy has been standing up for this young man in the midst of bullies...and now this little boy has asked my son to back away, citing that he could handle himself....but he wants him to stick around to be a witness though...WhAT?? My son added that this child makes comments such as "what are you going to do about it: when confronted. I decided to call the childs' guardian, his grandmother, who we see twice a week at karate practice. I told him that her grandchild was exhibiting this behavior, and I was afraid that something bad would happen if it continued. I added that he had been pushed down and been experiencing the "fake punches". THIS WOMAN immediately began to defend this young man and then started to turn the tables on me saying that last year my boy called his boy a nerd. I set her straight there...both of the boys wear glasses and they are both called nerds. Apparently the grandchild is telling pity stories to his grandmother, who dotes on him so much it is sickening. THE CHILD CAN DO NO WRONG!!!! To add insult to injury, she said that my little boy wrote DORK under his signature in her grandchilds yearbook. MY BOY BECAME ABSOLUTELY FURIOUS stating that he never did that, and that he would put his hand on a bible and hoped to die. I got off of the phone to get the whole story, and then my son called her back up to reiterate what he told me. She litterally had my little boy in tears...he told her that he did not write that and didn't even know what it meant. She said "it is in your handwriting". My little boy was so distraught that he had an asthma attack speaking to her...he excused himself and hung up. I called her back after my little guy got to feeling better, and she insists that Kurt wrote this. I said, "why would he sign his name and then write DORk underneath it...it would say that he (my boy) was the DORK. She reiterated, it is in his handwriting...HOW CAN YOU DETERMINE HANDWRITING BY 4 PRINTED LETTERS?!?!?! My little girl and little boy both wrote the word and they looked identical. I told her that...she won't back down. I truly believe that the grandchild wrote this under Kurts signature in an effort to get pity from his grandmother, but I can't prove it. NOw, today, the 4 of us, Grandma and grandson, Me and my son are going to meet to get this settled. These 2 boys have karate together and we need to get this out of the way or practices will be a living hell for everyone involved. I Am totally worried about this meeting, the Grandmother is not going to back down and neither am I...what can I say to help put this behind us? How would you handle this whole situation? PLEASE HELP!!!!