Someone's mother has 4 sons:North,West,and South. What is the name of the fourth son. Tell me with the name of the fourth son. If you lose you have to repost.
小黄(男生)要去外地出差学习很久,还不知道回来的时间。小黄的父亲因为左腿截肢而需要拄拐行走,但他却执意送小黄到火车站。当小黄准备进火车站的时候,父亲指了指他被截肢的地方,没有说话。小黄点了点头,转身离去上了火车。
请问:小黄的父亲想表达什么?