数据错误 / Data error: 陳文龍 (15213) coded as grandson (孫) of 陳俊卿 (10884); sources say 之後／五世從孫 (collateral) #23

Thanks for maintaining CBDB and the SQLite distribution. This is a kinship-coding error in the bulk SQLite DB; I've traced it back to the cited source and reconstructed the lineage so it should be quick to verify.

中文 TL;DR. CBDB 现将 陳文龍 (15213) 记为 陳俊卿 (10884) 之孫（KIN_DATA kincode 243 SS），反向记为「祖父」（kincode 62 FF，来源＝「未知」0）。然而所引来源《宋人傳記資料索引》(source 7596) 所本之 《宋史·卷451·陳文龍傳》 原文作「丞相俊卿之後也」（後 = 后裔，非孫）；學界與玉湖陳氏族譜均作「五世從孫」（旁支），其父為 陳粢。文龍與陳俊卿分屬玉湖陳氏自二世祖貴以下的兩支：俊卿出詵房（四世），文龍出德戴房（八世）。建議將此祖孫關係改為旁系/遠裔或刪除待核，並補錄其父陳粢；文龍與陳瓚 (15201) 之叔姪關係有《宋史》為據，應保留。

English summary. CBDB encodes a lineal grandfather→grandson link between Junqing (10884) and Wenlong (15213). The primary source the citation rests on says only descendant (之後), not grandson (孫); scholarship and the 玉湖陳氏 genealogy read 五世從孫 — a collateral descendant. The two men sit on two different branches of the Yuhu Chen that split at the 2nd-generation ancestor 貴.

1. The records (bulk SQLite KIN_DATA)

2. Source trace-back — every layer says "descendant/collateral," none says "grandson"

3. The lineage in detail (玉湖陳氏 / Yuhu Chen)

The clan's two Southern Song chancellors — Junqing and Wenlong — are the source of the epithet 「一門二丞相，九代八太師」. They are not lineal grandfather/grandson; they head two branches that diverge at the 2nd-generation ancestor 貴 (Chen Gui). Yuhu-generation numbers; CBDB IDs and posthumous 太師 dukedoms shown where attested:

Gen 1  仁  Chen Ren (1015–1064)            — Yuhu founder; posth. 太師 沂國公
Gen 2  貴  Chen Gui                        — posth. 太師 蜀國公
        │
        ├── Branch A (詵 line) ───────────────────────────────────────────
        │   Gen 3  詵  Chen Shen (CBDB 10883)    — posth. 太師 冀國公
        │   Gen 4  俊卿 Chen Junqing (CBDB 10884, 1113–1186) ★ Chancellor #1; 太師 魏國公
        │   Gen 5  宓  Chen Mi (CBDB 10892, 1171–1230)   — Junqing's 4th son
        │   Gen 6  〔Mi's son〕
        │   Gen 7  瓚  Chen Zan (CBDB 15201, d. 1277) ★ martyr
        │          └─ CBDB FF = 宓 (10892): Zan is Junqing's great-grandson — chronologically clean
        │
        └── Branch B (德戴 line) ──────────────────────────────────────────
            Gen 3  德戴 Chen Dedai                — brother of 詵
            Gen 4  宋卿 Chen Songqing
            Gen 5  欽紹 Chen Qinshao             — posth. 太師 永國公
            Gen 6  家/衰/寬 Chen Jia             — posth. 太師 安國公
            Gen 7  粢  Chen Zi                   — posth. 太師 榮國公   [Wenlong's father]
            Gen 8  文龍 Chen Wenlong (CBDB 15213, 1232–1277) ★ Chancellor #2; 太師 忠肅

Two things this makes clear:

• The "八太師" is a cross-branch prestige roster, not a patriline. The eight 太師 titles run gens 1–4 on Branch A (仁→貴→詵→俊卿) and gens 5–8 on Branch B (欽紹→家→粢→文龍); six are posthumous ennoblements conferred when each chancellor was honored. The 沂/蜀/冀國公 (Branch A) and 永/安/榮國公 (Branch B) dukedoms independently corroborate the two-branch shape. Collapsing this roster into a literal 祖→孫 is, we believe, how the 孫 edge arose.
• Zan (15201) is the genuine lineal descendant; Wenlong is the collateral one. CBDB's own record places Zan's grandfather as 宓 (Junqing's son) — sound. Wenlong descends on Branch B, with no father currently recorded in CBDB (KIN_DATA has no F row for 15213); his father is 陳粢 (Chen Zi). The 文龍↔瓚 uncle/nephew tie (《宋史》-sourced) is therefore a cross-branch relation and is correct as-is.

(Counting note: the genealogy places Wenlong four generations below Junqing; scholarship's 「五世從孫」 uses inclusive 世-counting. Either way the relation is collateral, not 祖/孫.) This reconstruction is concordant across three editions in our corpus: the family manuscript copy (002-right), the 1937 Waihai Zupu Gao (外海鄉陳氏族譜稿, leaves 0007–0008), and the 1971 Utah Genealogical Society microfilm (frames 0012/0021, which states the collateral relation explicitly).

4. Why the lineal edge is doubtful (internal checks)

• No father for 15213 (no F row) — Wenlong is attached straight to Junqing with intervening generations absent.
• Provenance asymmetry: lineal edge cites only an index (7596) one way, 未知 the other; the collateral 文龍↔瓚 edge is《宋史》-sourced both ways.
• Chronology: Junqing b. 1113, Wenlong b. 1232 → 119 yrs for a claimed 2-generation link (~60 yrs/gen). CBDB also makes Wenlong (b. 1232) the uncle of Zan (c_index_year 1231) — an uncle the age of his nephew. Across the genealogy's branch spacing (~30 yrs/gen) the dates are consistent.

5. Suggested fix

• Re-map or remove the lineal edge between 15213 ↔ 10884 (kincodes 243 / 62); sources support a collateral descendant (之後 / 五世從孫), not 祖父/孫.
• Add Wenlong's father 陳粢 (Chen Zi) so the Branch B descent models correctly.
• Keep the 《宋史》-sourced 文龍↔瓚 uncle/nephew edge.
• Fix surface (matches your workflow): https://input.cbdb.fas.harvard.edu/basicinformation/15213/kinship

6. Reproduce

SELECT k.c_personid, bf.c_name_chn AS focal, k.c_kin_code, kc.c_kinrel_chn,
       k.c_kin_id, bk.c_name_chn AS kin, k.c_source, t.c_title_chn
FROM KIN_DATA k
JOIN KINSHIP_CODES kc ON kc.c_kincode=k.c_kin_code
LEFT JOIN BIOG_MAIN bf ON bf.c_personid=k.c_personid
LEFT JOIN BIOG_MAIN bk ON bk.c_personid=k.c_kin_id
LEFT JOIN TEXT_CODES t ON t.c_textid=k.c_source
WHERE k.c_personid IN (10884,15213,15201) ORDER BY k.c_personid;
-- no father for Wenlong →
SELECT * FROM KIN_DATA k JOIN KINSHIP_CODES kc ON kc.c_kincode=k.c_kin_code
WHERE k.c_personid=15213 AND kc.c_kinrel='F';  -- 0 rows

I have the multi-edition genealogy reconstruction (family copy + 1937 + 1971) showing the 貴→德戴→宋卿→欽紹→家→粢→文龍 line and can share scans/transcriptions on request.

— Reggie Chan (reggie.chan@gmail.com), Yuhu / Waihai Chen genealogy digitization project

Sources: 宋史卷451 (CTEXT chapter 658565); 陳文龍, zh.wikipedia; CBDB bulk SQLite (KIN_DATA/KINSHIP_CODES/BIOG_MAIN/TEXT_CODES).