Luke's Gospel, along with Acts, provides a history of Jesus' disciples and Jesus' life.
Here, we see the announcement to Mary that she is to have a son. It follows the announcement to Zechariah that his wife, Elizabeth was also to have a child. Elizabeth was a relative to Mary. so Jesus and John the baptist were cousins. John was born first, six months before Jesus. Via Wikipedia "Luke then tells the story of Gabriel's visit to Mary, informing her that she will soon have a virgin conception by God. The account is recorded differently in Matthew 1:20, where an unnamed angel appears to Joseph after he has discovered that Mary is pregnant. Gabriel goes to Nazareth and visits Mary, who Luke tells us is a virgin engaged or betrothed to Joseph. The name Mary means "excellence", while Joseph means "May Yahweh add"" "Paul never mentions a virgin birth for Jesus, but in Romans 1:3–4 speaks of him as the Son of God by virtue of his resurrection, and states he had a more than human nature. Luke here has Jesus' divine nature declared from the first moment of his conception"