No it does not apply for it is not used that way in the NT as the Greek shows for NT use.
Incorrect. In the NT, one of the definitions for "
ἀδελφός" (adelphos; plural
ἀδελφοὶ adelphoi) and "
ἀδελφή" (adelphē) are "kinsman" or "kinswoman":
Greek Dictionary
Forms of the word
Dictionary: ἀδελφός, -οῦ, ὁ
Greek transliteration: adelphos
Simplified transliteration: adelphos
Numbers
Strong's number: 80
GK Number: 81
Statistics
Frequency in New Testament: 343
Morphology of Biblical Greek Tag: n-2a
Gloss:
brother, fellow countryman, neighbor (often inclusive in gender); by extension a fellow believer in the family of faith; in the plural
brothers regularly refers to men and women
Definition:
a brother,
near kinsman, or
relative; one of the same nation or nature; one of equal rank and dignity; an associate, a member of the Christian community
Greek Dictionary
Forms of the word
Dictionary: ἀδελφή, -ῆς, ἡ
Greek transliteration: adelphē
Simplified transliteration:
adelphe
Numbers
Strong's number: 79
GK Number: 80
Statistics
Frequency in New Testament: 26
Morphology of Biblical Greek Tag: n-1b
Gloss:
sister, fellow countrywoman; by extension a female believer, a sister in the family of faith
Definition:
a sister;
near kinswoman, or
female relative, a female member of the Christian community
A kinsman or kinswoman can refer to a sibling, cousin, nephew, niece, uncle, aunt, etc. In Matt. 13:55 and Mk. 6:3, Joseph, Simon, James, and Judas (Jude/Thaddeus) were called Jesus's "
ἀδελφοὶ" (adelphoi), and the context shows that the definition "kinsman" applies, but the information needed to determine whether they were His siblings, cousins, nephews, or uncles, etc., is lacking in those same verses.
You've yet to provide evidence that shows Jesus's kinsmen Joseph, Simon, James, and Judas (Jude/Thaddeus) were His siblings. However, I, in the opening post, provided evidence that those kinsmen were Jesus's cousins by showing they were the sons of Mary's spouse's brother, Alphaeus, and that James and Judas (Jude/Thaddeus) were the apostles James and Judas of Alphaeus, etc.
Note: nowhere in Scripture is it stated that Apostle James of Alphaeus and Apostle Matthew (Levi) of Alphaeus were brothers [siblings]. Of the twelve apostles, only Apostle Judas (Jude/Thaddeus) of Alphaeus is called James's brother [sibling] (Lk. 6:15-16, Ac. 1:13). James and Matthew's (Levi) father's merely shared the name "Alphaeus".
Because He is called "firstborn" which by normal grammar and understanding explicitly means they are the first of at least two.
The word used in Lk. 2:7 is "
πρωτότοκος" (prōtotokos). Show it "explicitly means they are the first of at least two" in that verse.
Now I know many people think Jews are not very smart, but they are intelligent enough not to name two daughtees of the same parents "Mary".
The opening post shows the sisters Mary of Joseph and Mary of Cleophas/Clopas (Alphaeus) were sisters-in-law, as the latter was the wife of Alphaeus, Joseph's brother, and the mother of Joseph, Simon, James, and Judas (Jude/Thaddeus).