What should I post on the Spring Festival couplets after the death of an old man at home?

Do it according to local customs, my friend. According to our local customs, in your case, you can post "special" Spring Festival couplets. For example, the first year's white, the second year's yellow and the third year's green Spring Festival couplets paper, please ask someone to write "Spring Festival couplets" with a brush, and stick this special Spring Festival couplets for three years, which is a kind of filial piety, but it does not affect each other's New Year greetings. However, as far as I know, in some places, when an elder in the family died, the Spring Festival couplets were not posted in the first year, and a string of white paper money was hung at the door. In those years, the village would not pay New Year greetings to his family. On the one hand, it was said that it was afraid of "bad luck", and on the other hand, it was said that it would be "influential" for everyone to wear red clothes to his house. However, in the second year, the traditional Spring Festival couplets will be posted as usual to pay New Year greetings to each other. Traditionally, the death of an old man in his nineties is a "funeral". However, it is good to observe the local "funeral customs" and handle them according to the local traditional culture. After all, this kind of thing is different in different places and cannot be generalized.

For example, in some areas, if an elderly person is sick at home, make a coffin in advance and pay attention to "disaster relief" so that the elderly can get better quickly. In some places, there are old people at home, and coffins have been made long ago, and there will be food and other things in them. There is nothing wrong with using coffins after the old people have been a hundred years. It is this custom. However, in this case, if we make a coffin for the elderly in advance in our local area, it will be considered as "disrespectful" and "cursing" the old man's death. That is absolutely unacceptable and will be "scolded to death" by the villagers. In the local area, it is simply impossible to be a man.

in these two cases, it is a change of customs. As long as in the local funeral customs, people don't call it a thing if they recognize it, and don't do anything out of line, there is no problem. What you said about putting up Spring Festival couplets also belongs to this custom, changing customs. However, it is certain that the traditional red Spring Festival couplets can't be posted, because the red Spring Festival couplets represent happiness. Besides, the Spring Festival couplets are a substitute for ancient people to celebrate the Spring Festival and hang peach symbols at the door. Peach trees have a superstitious saying of repelling "monsters", and the red Spring Festival couplets also have this meaning. No matter what kind of folk custom, all red Spring Festival couplets and door gods can't be posted. As for how to do it? If you really don't understand the local customs, ask the relatives and elders in the village and listen to their arrangements.