Shelter Skelter was like that, but with two guys. One guy is a big doomsday prepper with a bomb shelter in the basement, and is upset when his wife and kids take a trip out of state to visit relatives during a political crisis. He has a friend at the house with him, and a sudden explosion sends them to the family…

You may be thinking of an episode from the New Twilight Zone from 1987, Shelter Skelter: https://en.wikipedia.org/wi…
This episode actually popped into my head too when I watched the trailer today.