The poem reads like a list of people the speaker has lost, or is addressing from somewhere close to death. Almost every line starts with "To," as if the speaker is sending greetings or messages: a father, an aunt, a brother, friends, grandparents. Family fills the list, and the repetition makes it feel like a slow, tender count of everyone who matters.
Midway through, the speaker asks whether heaven is "this bright" and "so white," which sounds like someone glimpsing the afterlife, unsure what they're seeing. Then the tone turns. The speaker addresses doctors and nurses and asks, "Why did you not let me go," which suggests they were pulled back from death and may feel torn about it. The last two lines seem to answer that question from another voice: people here need you, so don't sink that low.
The mood is quiet, aching, and unsettled, caught between longing for the dead and the pull of the living.