Heaven is the place of perfect happiness -- and one of its greatest joys will be our reunion with those who have gone there before us. God loves us, and He won't withhold that joy from us!
How do we know this? We know it first of all from the Bible's explicit teaching. When King David's infant son was taken from him, David felt his loss very keenly -- but he also knew he would see him again. David declared, "Can I bring him back again? I will go to him" (2 Samuel 12:23). When Jesus was transfigured (or changed) before the eyes of some of His disciples and they glimpsed His heavenly glory, we're told that Moses and Elijah appeared with Him -- proof that we retain our individuality in heaven (see Luke 9:28-36).
We know it too because the Bible tells us we will be together in heaven. In other words, we won't be separated from each other, nor will we be absorbed into some kind of faceless mob. At the end of time, "we who are still alive and are left will be caught up together.... And so we will be with the Lord forever" (1 Thessalonians 4:17).
The most important fact about heaven, however, is that we will be safely in God's presence forever. Think of it -- no more fear, or sorrow, or pain! Is heaven your destination? Don't gamble with your soul, but make sure of your eternal salvation by giving your life to Christ today.