Should I Keep Trying to Stay in Touch With My Niece and Nephew?

Oh, that's sad, isn't it? Not just a loss for you, but for them, too, to not have the fun aunt in their lives anymore! I would think just back off for now, but first dropping a note that says "I'll always be here if you need me." A card on their birthday and Christmas will keep you in their hearts, however, so they won't forget you. Good luck.