I'm so sorry for your loss. I know this must be difficult, and I send you my condolences. In the Bible, there are a couple passages I think you'll appreciate. In Isaiah 25:8, God promises to swallow up death forever. In John 5: 28,29, he also promises to resurrect them back to life. So not only will they come back, they'll never die again. I hope you find that comforting.