Granny Wars: A Game of Tit for Tat

From BoardGameGeek:

Your Granny's position as the town's top handicrafter is threatened by upstart contenders from a new retirement community. Your task is to try to help her, while distracting and sabotaging her competitors – but if you don't keep your loyalty hidden, the other players will definitely stitch you up! At the beginning of Granny Wars: A Game of Tit for Tat, you receive a secret loyalty card matching one of the Granny cards on the table, and you are dealt ten cards which range from -5 to +5 points. The deck also includes Gold cards, which grant a special Granny power (like "Nana Nap") in addition to points. Players take turns adding cards to the Grannies, and the "Tit for Tat" mechanism allows a player to "bounce" an equal and opposite card from one pile to another, e.g., playing a +3 on a -3 lets a player move the -3 to another pile of their choice. After everyone has exhausted their 10 cards, players reveal which Granny they supported and sum the points in her pile of cards. The game can be played by 2 players, with a small modification to the rules.