It's like the 4th wall is not even there.

Parent generation fails to prevent disaster.
Future children get the worst ending.
Lucina challenges her fate.
The children travel back in time to protect their parents and ensure they do not fail.

Since Robin (the player's avatar) can pair with anyone, including the children, you can chain pairings so that Chrom almost becomes a great-grandfather (except the game doesn't have a third generation beyond the children).

Sword hand twitches.