问:两年前,我和哥哥签订了一份《养老送终协议》,约定他负责赡养爸爸,我负责赡养妈妈,各自将老人送终,费用自理,互不干涉。半年前,爸爸患肺癌住院治疗,医疗费昂贵。哥哥以经济条件不好,无力完全承担医疗费为由,要求我分担一部分。请问,我和哥哥签订的《养老 Q: Two years ago, my brother and I signed a “Agreement on End-of-Pension”, which stipulated that he was responsible for the maintenance of Dad. I was responsible for supporting my mom and each of them would send the elderly to their own expenses at their own expense without interfering with each other. Six months ago, my father suffering from lung cancer hospitalization, medical expenses expensive. My brother to poor economic conditions, unable to fully afford medical expenses, asked me to share part. Excuse me, my brother and I signed the "pension