How do we know that James was not Jesus' brother, and he is not son of Mary?

[Jungang]

How do we know that James was not Jesus’ brother, and he is not son of Mary?

 

[Devon_Caffran]

The following links should assist you in better understanding Mary’s perpetual virginity. If you have any further questions or concerns that are not answered by these links, please [contact Catholic Answers (http://www.catholic.com/home/contact.asp) directly.
**Recommended Reading:
**

• Doesn’t Scripture imply that Mary had children other than Jesus?
• ** Did Jesus have brothers?**
• ** Perpetual Virginity: Why is this important?**
• ** Mary: Ever Virgin**
• ** Why should any doctrine not explicitly referred to in the Bible, be listened to?**
• ** How do you respond to “Everything you need to know is in the Bible”?**
• ** How can we know a doctrine is true if it’s not in the Bible?**
• ** How do we know that the Protoevangelium of James is credible?**
• ** Does Church Tradtion exist only to interpret Scripture?**
• ** Non-Canonical Writings…**
• ** Oral Traditions not found in the Bible**