欠条 我王*欠刘*五万块钱 替王某还房款，三个月内还清. 身份证号****** 2016 欠条                                         我王*欠刘*五万块钱 替王某还房款，三个月内还清. 身份证号******                                                                                                                                  2016.6.10                                                                           王*                  欠条内容是这样的 欠我钱的一方没钱还我 她妹妹打了个欠条给我 承诺替她姐姐还钱 到现在一年多了推托不还  我想咨询如果打官司的话  能不能起诉欠钱方的妹妹让她还钱 该欠条具不具备我打官司的证据