 If your family loves Jesus, you too are a part of the church. The church technically is not the building. It's made up of the people in it. It comes from the Greek word ekklesia, which means the called out one. So anybody that loves Jesus is the church. Nevertheless, he was writing to a lady who was chosen by God, whether she was leading a church in her home or had a church in her home, or this is just to her family and to the children. Whom I love in the truth.