What do you mean, father died before mother?

This is a sentence that can explain each other. The traditional explanation is 1. Father died before mother. Father died before mother, and mother died later.

2。 Father died before mother, father was still alive, and mother died first.

This is similar to a problem: there is a clean woman and a dirty man who doesn't like to take a bath all day. Guess who can take a shower? The answer can be said to be a woman, because a woman can take a shower when she sees a man is dirty, or she can take a shower because he knows he is dirty.