How many days can a child not travel after his parents die?

There used to be a saying that filial piety lasts for three years. Now, regardless of moral laws, you can go out as long as you finish the funeral. If you pay attention to customs, it varies from place to place, according to the time of local wake worship, such as the seventh day of the seventh month, the longest hundred days. If the old man and his wife are still alive and stay at home for a long time in a bad mood, they need to travel with the old man to relax.