Three short lines hold a small, quiet scene: a family gathered indoors while ice covers the world outside. The repetition in "home all at home" does most of the work. Saying "home" twice makes the word feel warm and settled, and "all" suggests everyone is present, nobody missing. The title, "Winter reunion," backs this up, so we picture people who may not often be in the same place finally sharing a house.
Then the poem turns to "an afternoon / of ice." The line break leaves "of ice" hanging by itself, and the word feels cold and still. Ice might keep people in, slow everything down, or hint at a frozen, suspended moment. The speaker doesn't say how they feel, but the tone suggests contentment mixed with a little stillness, maybe even a sense that this closeness can't last. The mood is cozy but fragile, like a moment you want to hold onto while the weather holds everyone in place.