It is the official position of the Roman Catholic Church that Jesus’ mother Mary remained a virgin for her entire life. This in contradiction to scripture.
As you should know, the word used to describe Jesus's "brothers" can also mean "cousins." So it's not clear that He did have brothers.
Context and usage of the term will make it clear.
“When we come to the New Testament, where the reference to the brothers of Jesus occurs, Von Soden correctly listed only two possible meanings for adelphos, namely, “either ‘physical brotherhood’ in the strict sense or more generally the ‘spiritual brotherhood’ of Israelites or Christians” (Kittel, 1964, 1:144).
A broadened meaning for adelphos (to refer to a cousin) does not exist in the New Testament. As Walther Gunther clarified: “In no case in the New Testament can adelphos be interpreted with certainty in this sense” (Brown, 1975, 1:256). That’s putting it mildly.
McClintock and Strong explained: “[W]hen the word is used in any but its proper sense, the context prevents the possibility of confusion…. If, then, the word ‘brethren’…really means ‘cousins’ or ‘kinsmen,’ it will be the only instance of such an application in which no data are given to correct the laxity of meaning” (1968, 895, emp. in orig.).
Lewis stated even more decisively: “ ‘Brothers’ (adelphoi) never means ‘cousins’ in New Testament Greek” (1976, 1:181, emp. added).
Indeed, the Greek language had a separate and distinct word for “cousins”—anepsioi (e.g., Colossians 4:10). When a nephew was meant, the relationship was clearly specified (e.g., Acts 23:16).
To summarize: “There is therefore no adequate warrant in the language alone to take ‘brethren’ as meaning ‘relatives,’ and therefore the a priori presumption is in favor of a literal acceptation of the term” (McClintock and Strong, 1:895).”
https://apologeticspress.org/did-jesus-have-fleshly-half-brothers-1271/
There is a Greek word for cousins. It is used once but never describing the brothers and sisters of Jesus.
‘CAN’ mean.
So who were Jesus’ uncles that fathered these ‘cousins’?