写一封letter to visa officer,申明由你承担round trip flight ticket, visitors medical insurance,all living expenses,同时列出一个旅游计划，比如大瀑布，加东游等，同时，老人很享受国内的退休生活和大家族的欢乐且有稳定的退休金，届时会如期回国to continiue his happy retirement life resting assured his children enjoy theirs on the forein land.附上自己翻译的退休金和财产证明，还有老人国内不可分割的关系。