By all means cite the verses which indicate this.
And, more to the point, there is no evidence whatsoever to suggest they did not.
Why did Jesus Christ entrust His mother to St. John at the Crucifixion if He had brothers? Why would He violate Jewish tradition in this way?
It is actually an extraordinary claim. And extraordinary claims require extraordinary evidence.
No, it is impossible to prove a negative. YOU would need to prove that the Blessed Virgin Mary had other children.
>>By all means cite the verses which indicate this.<<
Pretty much any verse discussing Mary, which are few and far between, and have been brought up many times in this thread.
>>Why would He violate Jewish tradition in this way?<<
First, Jesus was an expert at violating “the letter” of the Jewish tradition. Second, even if I were to say, “Ok, the only child born of Mary was Jesus”, what does that have to do with any of us at all. I’m really missing something here.
“By all means cite the verses which indicate this.”
All the verses already cited about the brothers and sisters of Jesus.
“Why did Jesus Christ entrust His mother to St. John at the Crucifixion if He had brothers? Why would He violate Jewish tradition in this way?”
Why wouldn’t he have entrusted her to ANY male family members, if he had step-brothers?
“YOU would need to prove that the Blessed Virgin Mary had other children.”
Sorry, but given verses talking about the brothers and sisters of Jesus, and Joseph refraining from intercourse UNTIL the birth of Jesus, and Jesus being the firstborn, it is up to YOU to explain why folks shouldn’t take those at face value.