They didn't use it to describe Jesus siblings as cousin because they were not, none of them use it and not because they weren't allowed.
Note: Please take your time reading the following. I took extra time trying to verbalize clearly as I could for you what I intended to convey. Thank you.
Even if you believed that Joseph, Simon
, James, and Judas (Jude/Thaddeus) were Jesus's cousins, it still doesn't mean the New Testament translators would've used the Koine Greek word
"ἀνεψιός" (ἀνεψιός anepsios) because they didn't have to.
"ἀνεψιός" (ἀνεψιός anepsios) isn't the only Koine Greek word that can refer to someone's cousin, there's also
"ἀδελφός" (sing. adelphos; pl. ἀδελφοὶ adelphoi) and
"συγγενής" (syngenēs), etc. And, since you acknowledge that the New Testament translators weren't forbidden from using any other Koine Greeks words to refer to someone's cousin, such as
"ἀδελφός" (sing. ἀδελφός adelphos;
pl. ἀδελφοὶ adelphoi), their use of that specific word in itself doesn't mean Joseph, Simon
, James, and Judas (Jude/Thaddeus) weren't Jesus's cousins.
In Matt. 13:55/Mk. 6:3, Joseph, Simon, James, and Judas (Jude/Thaddeus) are called Jesus's "brothers", or
"ἀδελφοί" (sing. ἀδελφός adelphos; pl. ἀδελφοὶ adelphoi) in the original language used. The English and Koine Greek word for
"brother(s)" both have multiple definitions, one definition they
don't share is "siblings
", nor any other specific type of kinsman/relative, but they
do share the broader familial definition "kinsman", and a kinsman/relative can be a sibling, cousin, nephew, or uncle, etc. If we agree Jesus's brothers in Matt. 13:55/Mk. 6:3 were His family, then we can't assume any specific type of kinsman/relative applies to them, because, again, the definition shared between the English and Koine Greek word for
"brother(s)" isn't any specific type of kinsman/relative, but rather "a near kinsman, or relative." And, what can tell us which
specific type of kinsman/relative applies isn't the English and Koine Greek word for
"brother(s)" themselves, but rather other information, such as lineage, testimonials, etc.
Therefore, what information do you have, if any, that shows why
siblings is the specific type of kinsman/relative that applies to Joseph, Simon
, James, and Judas (Jude/Thaddeus) in Matt. 13:55/Mk. 6:3? My information that shows why
cousins is the specific type of kinsman/relative that applies to Joseph, Simon
, James, and Judas (Jude/Thaddeus) in Matt. 13:55/Mk. 6:3 can be found
here.
Post the three verses not just the location.
"Is this not the carpenter’s son? Is His mother not called Mary, and
His brothers, James, Joseph, Simon, and Judas?" (Matt. 13:55/Mk. 6:3)
"Then three years later I went up to Jerusalem to become acquainted with Cephas, and stayed with him for fifteen days. But I did not see another one of the apostles except
James,
the Lord’s brother." (Gal. 1:18-19)
Do you believe the James in Matt. 13:55/Mk. 6:3 and the James in Gal. 1:19 were the same person?