I understand what your sister, her husband and you are going through at the present time. I lost my wife to breast cancer last February. We would always attend the games with our son, daughter-in-law and grandson due to our son's generosity of purchasing the tickets for us. I will feel a huge void going to the game Saturday evening without my wife. Ask for help from anyone that can possibly assist you. People will be more than willing to help you. What you are doing for your sister and her husband can never be replaced.