What more proof do you need than the Scripture that state Mary was a virgin.
Isa 7:14 Therefore the Lord Himself will give you a sign: Behold, the virgin shall conceive and bear a Son, and shall call His name Immanuel.
Luke 1:26 In the sixth month the angel Gabriel was sent from God to a city of Galilee named Nazareth,
v. 27 to a virgin betrothed to a man whose name was Joseph, of the house of David. And the virgin's name was Mary.
Luke 1:30 And the angel said to her, "Do not be afraid, Mary, for you have found favor with God.
v. 31 And behold, you will conceive in your womb and bear a son, and you shall call his name Jesus.
Luke 1:34 And Mary said to the angel, "How will this be, since I am a virgin?" (ESV)
Matt 1:23 "Behold, the virgin shall conceive and bear a son, and they shall call his name Immanuel" (which means, God with us).
Here is an email about the lineage of Jesus.
http://forums.bible-truths.com/index.php?topic=3811.0 -----
Apparently, Luke's account IS Mary's genealogy.
King James reads: "...the son of Joseph which was the son of Heli" (Luke 3:23).
Rotherham: "...the son of Joseph of Heli."
Concordant: "...being a son (as to the law) of Joseph, of Eli, of Matthat, of Levi.
Now then, "son of" is clearly not in the Greek, and so it is not necessarily fitting that
it should be supplied by the translators in this case.
Joseph in Matthew's genealogy of Jesus is not the "son of Heli" but rather Jacob (Matt. 1:16).
And so this could be a case such as we find in Deut. 25:5-6--"If brethren dwell together, and one of them die, and have no child, the wife of the dead shall not marry without unto a stranger: her HUSBAND'S BROTHER shall go in unto her, and take her to him to wife, and perform the duty of an husband's brother unto her. And it shall be, that the firstborn which she bears shall succeed IN THE NAME OF HIS BROTHER which is dead, that his name be not put out of Israel."
And so Heli may have been a "son IN LAW" rather than "a son." And this could be Mary's genealogy back to Solomon where they apparently merge again with Joseph's line. It is quite complicated. Theologians have made a life study of the genealogies, and their are several theories extant.
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From the commentary Treasures of Scriptural Knowledge (TSK) to add to what Ray had said about Jesus's lineage.
Luke 3:23
The real father of Joseph was Jacob (Mat_1:16); but having married the daughter of Heli (being perhaps adopted by him), he was called his son, and as such was entered in the public registers; Mary not being mentioned, because the Hebrews never permitted the name of a woman to enter the genealogical tables, but inserted her husband as the son of him who was, in reality, but his father-in-law.
Hence it appears that Matthew, who wrote principally for the Jews, traces the pedigree of Jesus Christ from Abraham, through whom the promises were given to the Jews, to David, and from David, through the line of Solomon, to Jacob the father of Joseph, the reputed or legal father of Christ;
and that Luke, who wrote for the Gentiles, extends his genealogy upwards from Heli, the father of Mary, through the line of Nathan, to David, and from David to Abraham, and from Abraham to Adam, who was the immediate “son of God” by creation, and to whom the promise of the Saviour was given in behalf of himself and all his posterity.
The two branches of descent from David, by Solomon and Nathan, being thus united in the persons of Mary and Joseph, Jesus the son of Mary re-united in himself all the blood, privileges, and rights, of the whole family of David; in consequence of which he is emphatically called “the Son of David.”
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mercy, peace and love
Kat