Tomorrow and Tomorrow and Tomorrow Kurt Vonnegut Jr.

This situation looks unpleasant. Lou and Em live in a crowded apartment with their entire extended family, crammed onto mattresses in the hallway, while Gramps keeps the only private bedroom for himself. Exploiting his seniority, Gramps decides who gets to sleep on the only other comfortable piece of furniture - a daybed - based on who is currently in his favor. At the time the story starts, Lou and Em are enjoying that comfort.