At the onset of Joshua Harmon’s wonderfully textured new play, “We Had a World,” Josh (played by Andrew Barth Feldman) is in his tighty-whities, scribbling in a notebook with a mechanical pencil at a desk on a corner of the stage. Just then his Nana — his dying Nana, to be specific — shows up onstage with a request. She has an idea for a play her grandson should write, a vicious “Who’s Afraid of Virginia Woolf”-style work about their family.

The play we’re seeing, in the intimate basement-esque New York City Center Stage II of the Manhattan Theater Club, is the playwright’s answer to his grandmother’s request. It’s not as vitriolic as Nana had asked for, but it is an all too relatable unpacking of the longstanding resentments and challenging dynamics of a family, particularly the ones between two of the central women in his life, his mother and his grandmother. If there’s viciousness here, it’s the complex, often vicious nature of the truth.