What does it mean that a single parent is dead?

There are two ways to say that parents are dead. One is that mom and dad are really dead, so they are all dead.

The other is that children are given away by their parents or elders since childhood. Foster parents lied to them. Your biological parents died long ago, so the child was adopted by adoptive parents. In short, children should also be grateful for their parents' lives. Children must be self-disciplined, confident, self-reliant and virtuous.