Does the separate word for “kinsman” (suggenes) tell against the cousin-reading of “the brethren of the Lord”?

Type: supporting argument (off-timeline) · Assessment: weak — the observation is true (Greek had a plain word for “kinsman,” suggenēs, and even sets it beside adelphos in one breath at Luke 14:12 and 21:16), but the inference — “a cousin would have been called suggenēs, so the brethren, called adelphoi, were not cousins” — is an argument from silence, rebutted by the Septuagint’s own habit of calling collateral kin adelphos (Lot the nephew; Jacob addressed by his uncle Laban) even where the kinsman-word lay ready. It lends the sibling-reading little positive weight; the real case against the cousin theory rests elsewhere · advanced by modern Protestant apologists (Eric Svendsen, James White)

The claim

— a common Protestant statement of the argument.¹ The point is a lexical-distinction move, and it is not the same as the “precise word for cousin” (anepsios) point weighed on the companion page. Its edge is that the Evangelists sometimes deploy suggenēs (“kinsman, relative”) in the same sentence as adelphos (“brother”), keeping the two apart: “call not thy friends, nor thy brethren (adelphous), neither thy kinsmen (suggeneis), nor thy rich neighbours” (Luke 14:12), and “ye shall be betrayed both by parents, and brethren (adelphōn), and kinsfolks (suggenōn), and friends” (Luke 21:16).² The force pressed: Greek had a ready, ordinary word for exactly the broad “relative/cousin” category, and used it right alongside adelphos to distinguish the two — so when the brethren of the Lord are always called adelphoi and never suggeneis, the natural inference is full or half siblings, not collateral kin. The narrow question weighed here is whether that inference holds.

Who advances it

The argument is a staple of the popular Protestant case for the Helvidian reading, and it is sharpened in the more careful modern defences that press New-Testament usage specifically. Eric Svendsen (Who Is My Mother?, 2001) and James White argue that the New Testament authors, writing Greek and not translating Hebrew, had the precise vocabulary to hand — anepsios for cousin (once, Colossians 4:10) and suggenēs for kinsman (a dozen times) — and used it, so their steady adelphos for the Lord’s brethren should be read at face value; when pressed with the looser Septuagint idiom, they grant the Old-Greek usage but “slim down” the test to the New Testament’s own diction.³ The observation itself is old and undisputed on the facts: suggenēs and its cognates carry “relative” through the New Testament — Elizabeth is Mary’s kinswoman (suggenis, Luke 1:36), a prophet is without honour “among his own kin” (suggeneusin, Mark 6:4), Paul greets his kinsmen (suggeneis, Romans 16:7, 11, 21; cf. 9:3) — and it is Luke, who uses the word most, who nonetheless calls the Lord’s brethren only adelphoi.⁴

The evidence for

Taken at its strongest, the argument assembles a real cumulative datum. The word suggenēs exists, is common, and means precisely “relative/kinsman” — the category into which a cousin falls. It is not a rare or learned term the Evangelists might have avoided: they reach for it a dozen times, and twice (Luke 14:12; 21:16) they set it beside adelphos within a single list, so the two are not treated as synonyms. Cousins, moreover, are the paradigm case the word covers; if the “brethren” were the Lord’s maternal cousins, the ordinary Greek word for that relation lay ready and unused. This dovetails with the parallel fact weighed on the companion page — that the exact word for cousin, anepsios, both existed (Colossians 4:10) and is reserved by Hegesippus for the one man in this family who really was a cousin, Symeon son of Clopas, while James and Jude are his adelphos.⁵ On the lexicon of the New Testament taken in isolation, then, the brethren look like siblings, not collaterals.

Adversarial assessment

What holds. The factual core is correct and undisputed: suggenēs is the plain Greek word for a relative, it is used freely in the New Testament, and it stands beside adelphos in Luke 14:12 and 21:16 without collapsing into it. Against the Hieronymian cousin-reading in particular this is a genuine makeweight, of a piece with the anepsios point and with Hegesippus’ own care to keep cousin and brother apart within the Lord’s kindred.

What is overstated. As a positive proof the argument leans on an inference it cannot support — the word-choice fallacy, “the word was available and not used here, therefore the meaning is excluded here.” Three things undo it.

First, a category-list is not a rule of exclusion. That Luke 14:12 and 21:16 name “brethren” and “kinsmen” side by side shows only that the two words are not synonyms — not that the sets are disjoint, still less that adelphos can never reach a collateral relative. The very same lists couple “friends” with “neighbours” and “parents” with “kinsfolk” and “friends,” categories that plainly overlap in real life (a brother is a kinsman; a neighbour may be a friend). Enumerating distinct terms in a series is a rhetorical sweep, not a lexical decree that each term excludes the others.

Second, and decisively, biblical Greek does not observe the alleged distinction. The Septuagint — the Greek the New Testament authors read, quoted, and wrote out of — calls collateral kin adelphos precisely where suggenēs would “fit”: Abraham calls his nephew Lot “brother” (adelphos, Genesis 13:8), Lot the nephew is “his brother” at the rescue (Genesis 14:14, 16), and Laban addresses his sister’s son Jacob, “Because thou art my brother (adelphos), shouldest thou therefore serve me for nought?” (Genesis 29:15) — an uncle-and-nephew tie, the paradigm suggenēs relationship, yet named adelphos.⁶ The premise “a collateral relative would have been called suggenēs” is thus falsified by the writers’ own scriptures, on the very cases (Lot, Jacob) that Jerome cited to license the extended sense.

Third, the “restrict it to New-Testament usage” rescue is ad hoc, and even if granted proves too little. The move — concede the Septuagint’s looseness, then insist the New Testament’s composed Greek is more precise — runs against the New Testament’s own character: its authors are steeped in Septuagint diction and quote it constantly, and the “brethren of the Lord” is exactly the kind of fixed, traditional designation of a Semitic-speaking family that would carry the idiom. The New Testament nowhere supplies the controlled minimal pair the argument needs — a passage where adelphos and suggenēs are shown to be mutually exclusive of the same person — and the two Lukan lists are not it. And even granted in full, the inference reaches only probability, never disproof; nor does it distinguish the reading it is meant to serve from its rival, since a stepbrother (the Epiphanian view) is called adelphos too and is no blood suggenēs of Jesus at all. Whatever force the argument has falls on the cousin-reading alone.

Where the real weight lies. Tellingly, the ablest defenders of the case against the cousins do not rest it here. J. B. Lightfoot, arguing the Helvidian view, freely grants that adelphos bears an extended kinship range, and rests his objection instead on usage, not vocabulary: “it is scarcely conceivable that the cousins of any one should be commonly and indeed exclusively styled his ‘brothers’ by indifferent persons; still less, that one cousin in particular should be singled out… ‘James the Lord’s brother.’”⁷ Richard Bauckham likewise concedes that adelphos “could sometimes be used more loosely of other close kinship relationships.”⁸ The load against the cousin theory is carried by Lightfoot’s usage-pattern point and by Hegesippus’ distinction within the family — not by the lexical-silence move weighed here.

Assessment

Weak. The datum is true — suggenēs exists, is common, and is co-listed with adelphos — and it belongs to the cumulative case against the Hieronymian reading. But as an independent argument it does not hold: it is an argument from silence, and the silence it leans on is broken by the Septuagint’s own adelphos-for-nephew (Lot; Jacob), the very idiom the New Testament writes out of. A category-list is not a rule of exclusion; the “restrict to New-Testament usage” escape is ad hoc and, even allowed, yields only probability while failing to touch the Epiphanian rival. So the observation mirrors the anepsios point already weighed: the availability of a precise word leaves the cousin-reading barely possible, no more, and lends the sibling-reading little positive weight of its own. The genuine weight against the cousins is Lightfoot’s — that collateral kin are nowhere else habitually and exclusively styled someone’s “brothers” by third parties — and Hegesippus’. Proponents who press Luke 14:12 and 21:16 as proof of a systematic distinction overstate a rhetorical category-list into a lexical law.

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