Bring some gifts for the elderly, such as cigarettes, wine, tea and fruit.
If he can smoke, don't smoke indoors, go outside.
You'd better not talk big. Old people hate young people to hide everything, so they don't discuss it. They listen to him alone.
Ask more about the youth of the elderly, so that the elderly can talk more and the young can listen more.
Eat well in the process of eating, and don't let the old people see that eating is worthless.
You should charge all these things first, and don't let the old man leave a good impression the first time.
When drinking with the old man and clinking glasses, your own glass must be lower than the old man's glass, and a little lower is better.
Go home as soon as possible after dinner, and don't sleep in the elderly. This kind of situation, the old man will look down upon.
Politeness to the elderly must be explained in advance. Better let him know.