the joys of children Buyer won item and now claims 6 year old child made the purchase. Have asked the buyer to request mutual cancellation of the sale but I am a little annoyed to be honest about the whole thing. Sorry just wanted to vent

check your buyers bidding history and see if they have been bidding on similiar items to the one the child has *supposedly* bid on and won!
This will determine if the buyer is telling the truth or not (in most cases)
Personally, I wouldnt allow a mutual cancellation.... I would open an Unpaid Item Dispute.