This is one of my all-time favorite plays and this is a terrific production of it too.
It's a very weird, but very entertaining play that is a satire on American culture and religion, but about a family that lives through various ages of human history as if they were contemporary or near-contemporary.
While the Antrobus family remains constant throughout the play, the three acts do not form a continuous narrative. The first act takes place during an impending ice age; in the second act the family circumstances have changed as George becomes president of the Fraternal Order of Mammals (apparent references to Sodom and Gomorrah but also to the Roaring Twenties), while the end of the world approaches a second time; the third act opens with Maggie and Gladys emerging from a bunker at the end of a seven-year-long war.
https://en.wikipedia.org/wiki/The_Skin_of_Our_Teeth
I'm almost certain that The Flintstones was inspired by Act I of this play, but I don't want to suggest that it's in any way like The Flintstones other than both being "modern stone-age families."