It is generally believed that minors (/kloc-under 0/2 years old), singers, violent deaths, etc. Will not enter the ancestral grave after death. Because it's bad for the living.
But it doesn't matter. Great men often don't go to their ancestral graves after they die. Another example is that people who emigrate cannot enter the ancestral graves after death, and people who go abroad cannot enter the ancestral graves after death.
From the perspective of Buddhism and Taoism, after death, the soul leaves the body and enters the next round. So what does it matter if you can't enter the ancestral grave?
The following friends are also right. Since there has been an accident of violent death or less death, it shows that Feng Shui is no longer good, and there is no need to go back to the ancestral grave.
Personal opinion, for reference only.