This foray into largely uncharted psychoanalytic territory addresses Ron Bodansky’s question about what siblings have to do with psychological survival and healing in situations of extreme developmental trauma. This article speculates that, except when psychological organization has been destroyed at an age when before sibling connections become relevant—see “Fear of Breakdown” (Winnicott, 1974)—siblings can both transmit timeless intergenerational trauma within a generation, and contribute to the survival of such damage. Sketches from clinical work, as well as from the Wittgenstein and Bonhoeffer families, illustrate these possibilities. A further conjecture suggests that sibling countertransferences contain the same two possibilities. Others may wish to extend or dispute these speculations.