I am sorry for your loss. A promise we have that can bring us comfort is found at Revelation 21:4, "And he will wipe out every tear from their eyes and death will be no more, neither will mourning nor outcry nor pain be anymore. The former things have passed away." This is a guarantee from God that he will undo all his enemy has done including removing death from the earth and even bringing back to life the ones we have lost. This will allow for his purpose for the earth to be fulfilled. www.jw.org has more on how this will come about and how we can play a part.