Your family should come first at all times. That being said, how would you react if your own sister took advantage of your kindness and love? Would you keep your unwavering devotion to her, or would you demand that she start expressing gratitude? The story below is an account of a frustrated brother. The original poster (OP) decided to help his younger sister in paying for her dream wedding after learning that she was experiencing financial difficulties. However, OP found out that his 'naïve' s…