There is an undeniable connection between siblings. You came from the same family and grew up in the same environment. There will always be a shared past between siblings, whether they are close or not. But when your sibling is diagnosed with mental illness the personal history and the things you had in common can seem to disappear.
Life seems to stop and be consumed by their illness. An intangible connection can be seemingly swept right off the page. Something that therapists never told me was that one day I would just be happy to take what I could get.