His only worry is that if he dies first his wife will have to live alone in a place where she has no relatives. The only thing he can do is bequeath his savings to Grandma Wang, so that she won't have to worry about money.
唯一擔心的只是要是自己先走一步，老伴就得一個人孤零零在異鄉生活，然而能做的也就是把存款簿交給王奶奶，往後生活至少不成問題。