Considering how the world will eventually end up, it's so heartbreaking to see it. How peaceful, how colorful, how lively it was.
Just after the flashback with the parents and the baby, we see the dog perched on the crib nosing at the old toy that hovered over it, completely unaware of the life the crib once held.Only a few actually make it inside, the rest are left to die as the bombs hit and blow them away. Before that it shows dozens of citizens (including children) panicking and making a frantic run for the nearby vault after the news broadcast announces the start of the Great War.The pre-war flashback shows a couple tending to their newborn baby in its crib, then later showing all three of them about to be blasted away by the shockwave after they get locked out of the Vault.Props to Bethesda for taking a somber (though still beautiful) song and making it tug at our heartstrings more than the writer of the song ever intended.
Especially after witnessing what happens to your wife/husband and son.