My husband was taught by someone as a child that we wouldn’t know our loved ones in heaven. He wondered if we would know our children and if they would know us.
1 Cor. 13:12 says that although now we only know in part, after the resurrection we will know in full even as we are fully known. To me this includes knowing family and friends as well as believers from across the entire spectrum of time. For example, we will know the Biblical figures of old as well as we know our closest friends.