You are being absolute based on, as you said yourself, ambiguous phraseology. So, if adelphoi can mean a relationship other than sibling, it can also mean sibling, thus, stalemate. Same with the expression, 'But he did not consummate their marriage until she gave birth to a son. And he gave him the name Jesus.' (Matthew 1:25). theefaith likes to do acrobatics with the word 'until', but, either way, it can still viably mean immediately, or soon after, therefore, another stalemate.Then show m BIBLICAL grounds for YOUR ridiculous claim.
Show me where it says that Mary had children other than Jesus.
DON'T show me verses that speak about the "Adelphoi" of Jesus because that word is used for MANY other things such as cousin, uncle, step-brother, half-brother, friend, neighbor, fellow Believer, etc.
Acts 1:15 talks about "120 SDELPHOI" gathered together to choose a successor for Judas.
Did they ALL come from the SAME mother? NO, because the 12 Apostles are among them and we KNOW they weren't ALL siblings.
I'll even go one step further - just to make it EASY on you.
Show me an extrabiblical (historical) document that talks about Mary having "other children".
I'll wait right here for your response . . .
So, taking all relevant Biblical on this subject matter into consideration i.e. her predetermined desire to marry Joseph, Joseph's agreement to marry her after his revelation, the fact that they followed through with the marriage and remained so for approx. 30 years (whether or not Joseph was alive at the crucifixion).
Any unbiased and unindoctrinated person would agree that Joseph and Mary consummated their marriage in a physically intimate manner, and consequently bore children together, namely James, Joses, Jude, Simon, and more than one daughter.