[sauropod]

Looking for the verse where James is named.

However, I did find this:

Mark 3:30-32 (New International Version, ©2010)

30 He said this because they were saying, “He has an impure spirit.”

31 Then Jesus’ mother and brothers arrived. Standing outside, they sent someone in to call him. 32 A crowd was sitting around him, and they told him, “Your mother and brothers are outside looking for you.”

Again, Jesus has siblings identified as existing in the Gospels. See also Luke 8:19.

How does this invalidate my point?

[narses]

“Again, Jesus has siblings identified as existing in the Gospels. See also Luke 8:19.”

Nope. You have a very poor translation of the Gospel. Very sad.

“And his mother and brethren came to him: and they could not come at him for the crowd.”

[Vegasrugrat]

25 But he had no union with her until she gave birth to a son. And he gave him the name Jesus. (Matthew 1:25)

The above scripture seems to corroborate your point.