The Immortalists by Chloe Benjamin

The basic premise of this story reads like a perfect dinner party conversation starter - if you knew when you were going to die would you live your life differently? The Gold children make the mistake of tracking down a local gypsy woman who tells them the date they will die. Armed with this knowledge they grow up responsible and scientific or loose and looking for the magic in the world.
As each of the sibling's date approaches the outcome begins to effect them. This is a classic family story about sibling love, jealousy and the common threads that bind them. It will make you want to call up your brothers and sisters and tell them you love them.