Prior to filing a lawsuit for negligence against Walmart on behalf of your grandson, it may be possible to settle the case with Walmart's insurance carrier.  Notify the insurance carrier in writing of your grandson's personal injury claim.When your grandson completes his medical treatment and is released by the doctor, obtain his medical bills and medical reports.  Your grandson's personal injury claim filed with Walmart's insurance carrier should include those items.Compensation for the medical bills is straight reimbursement.  The medical reports will document the injury and will be used to determine compensation for pain and suffering which is an amount in addition to the medical bills.If the case is settled with Walmart's insurance carrier, NO lawsuit is filed.If you are dissatisfied with settlement offers from Walmart's insurance carrier, reject the settlement offers and file a lawsuit on behalf of your grandson for negligence against Walmart.  You will need to be appointed guardian ad litem to file a lawsuit on behalf of your grandson because he is a minor.If the case is NOT settled, the lawsuit on behalf of your grandson must be filed prior to the expiration of the applicable statute of limitations or your grandson will lose his rights forever in the matter.