Fallout 3

Action role-playing game where you play on earth after it has been hit by a nuclear apocalypse. You play in and around the ruins of Washington D.C and your are searching for your father. Great game :).

I did like the Mothership Zeta DLC the most.

Fallout: New Vegas

Explore New Vegas, find the mysterious man that try to kill you and then help the faction of you choice to power. The best DLC was Old World Blues.

Fallout 4

Set in and around the city of Boston, known as "The Commonwealth". Four factions to work with, the Brotherhood of Steel, the Institute, the Minutemen or the Railroad. The story is about you trying to find your lost son. Like we care, we have fatman's to shoot with. I'm sure he show up someday.