Psalm69:8 I have become a stranger to my brothers, an alien to my mother’s sons.
for the waters have come up to my neck.
2 I sink in the miry depths,
where there is no foothold.
I have come into the deep waters;
the floods engulf me.
3 I am worn out calling for help;
my throat is parched.
My eyes fail,
looking for my God.
4 Those who hate me without reason
outnumber the hairs of my head;
many are my enemies without cause,
those who seek to destroy me.
I am forced to restore
what I did not steal.
5 You, God, know my folly;
my guilt is not hidden from you.
6 Lord, the Lord Almighty,
may those who hope in you
not be disgraced because of me;
God of Israel,
may those who seek you
not be put to shame because of me.
7 For I endure scorn for your sake,
and shame covers my face.
8 I am a foreigner to my own family,
a stranger to my own mothers children;
With out that assumption there is no proof what so ever that Mary had any more than one child.
Koine Greek is very precise. It has a word for male cousin, a word for female cousin, a word for brother and a word for sister. The word for ‘brother,’ not the word for, ‘cousin,’ is used in such passages as, Matthew 12:47:
Someone said to Him, Behold, Your mother and Your brothers are standing outside seeking to speak to You.
Strong's Concordance
anepsios: a cousin
Original Word: ἀνεψιός, οῦ, ὁ Part of Speech: Noun, Masculine Transliteration: anepsios Phonetic Spelling: (an-eps'-ee-os) Short Definition: a cousin Definition: a cousin, nephew.
[Note:I'll post again with a working link.] http://biblehub.com/greek/431.htm