My elder sister was extremely ill with cancer and at one point we didn't think she'd make it through the night, outside the room my mum gave me a hug and whispered 'I'm glad it's not you' in my ear.
That cut me so deep, I wish she would have said 'I wish it was you' rather than what she actually said. It absolutely destroyed me.
(The happy ending is my sister got through the night, went into remission and is now cancer free, heyooo)