One question that weighs on the hearts of many who have lost ones who were very close to them is whether we will recognize those loved ones in heaven. The Bible does not specifically address this question, but it does offer some hints to help us answer this question. One such clue is from when Jesus was transfigured (Mark 9). When Peter, James and John saw a glimpse of Jesus’ glory they also saw two men standing with Him. These two men were Moses and Elijah. Though the disciples had never seen either of those men they recognized them for who they were. The text seems to indicate that they just knew, by some unknown means, who the men were. Though it is possible that Jesus later told the three men who was standing with Him and that part of the conversation was just not recorded for us. Another passage that gives some help in answering this question is Luke 16. Jesus recounts the tale of the rich man and Lazarus. After death, the rich man in hell was able to look across to heaven. He recognized Abraham, whom he had never known in life, and Lazarus whom he had seen in life. This passage is a pretty clear indication that though we will have been given glorified bodies Christians will still be able to recognize one another in eternity.
I do not think we will recognize one another because of similarities to our current physical appearance. In 1 Corinthians 15 we are told that the earthly body will be replaced with a glorified body. The glorified body will be free from the corruption of sin and delivered from all the infirmities of the earthly body. The glorified body will be as unlike the earthly body as a stalk of wheat is unlike the seed. Whatever the physical appearance will be, it seems that we will be able to identify one another in heaven.
Many who ask this question do so seeking comfort that they will be reunited with loved ones. The certainty of seeing loved ones again in heaven is very comforting, but the Biblical description of interactions in heaven all revolve around our relationship with God the Father and Jesus. The relationships between believers in eternity are going to be very different from our earthly ones. The joy of a spouse or beloved child will be replaced by much greater joys. The relationships will be unlike what they were in life, but that difference does not mean they will be inferior. The relationships in heaven will be greatly superior to any and all relationships on this earth. All believers will rejoice together in perfection, harmony and eternal praise to God.