This teen is scratching their head wondering if they're supposed to share with a neighbor . The limits of neighborly kindness definitely apply here! This 16-year-old wrote to r/AmItheA**hole, asking about a situation that happened when their young neighbors — and the kids' entitled mom — came to visit. The OP says that they were playing with the kids, ages 7, 9, and 10, when they asked to play in her bedroom. The OP agreed, which might be mistake #1, because the nine year old quickly latched on…