- People do not marry after they die.
- People do not have children after they are dead.
- People are not born before their parents.
- People do not marry before their parents are born.
- The letters "bef" in front of a date matter.
- The letters "aft" in front of a date matter.
- The letters "about" in front of a date matter.
Note: A reader pointed out that men can have children born up to around nine months after they are dead. That's correct. Nine years afterwards is a bit much though!