Genealogy & Ancestry Search

Genealogy Research: From DNA to Original Documents — A Systematic Approach

Modern genealogy combines two streams of evidence that were never available simultaneously before: documentary records (census, vital, land, probate, immigration) and genetic evidence (autosomal, Y-DNA, mitochondrial DNA testing). Knowing how to integrate both — and understanding the limitations of each — separates solid genealogical conclusions from speculation.

The Genealogical Proof Standard

The Board for Certification of Genealogists defines the Genealogical Proof Standard (GPS) as five components that must all be satisfied before a genealogical conclusion is considered proven: (1) a reasonably exhaustive search; (2) complete and accurate citations to the sources used; (3) analysis and correlation of the evidence found; (4) resolution of all conflicting evidence; and (5) a written conclusion that explains and documents the reasoning. Meeting the GPS is what distinguishes a reliable family tree from an unverified collection of names.

Record Types Ranked by Reliability

U.S. Census Records: What Each Decade Shows

The federal census has been taken every 10 years since 1790. The 72-year rule means the most recent publicly available census is 1950 (released April 2022). Each decade added new fields: 1880 added relationship to head of household (first time families are identifiable as units); 1900–1930 added immigration year and parents' birthplaces; 1940 added the respondent's education level, income, and whether they worked the prior year. The 1890 census was almost entirely destroyed by fire — a significant gap in American genealogical records that researchers bridge with city directories, state censuses, and church records from 1885–1895.

DNA Testing for Genealogy: Which Test for Which Goal

Autosomal DNA (atDNA) — tests chromosomes 1–22, identifies cousins up to about 4th–5th degree reliably, both paternal and maternal lines. Best all-purpose test. AncestryDNA has the largest database (~25 million tested). Y-DNA — traces the direct paternal line (father's father's father...) unchanged across generations. Used to confirm/disprove a male line connection and to identify the geographic origin of a surname. Only biological males can take this test. Mitochondrial DNA (mtDNA) — traces the direct maternal line (mother's mother's mother...) unchanged across generations. Useful for deep ancestry and brick walls on the maternal line. Lower practical value for recent genealogy because mtDNA changes very slowly. The key to maximizing DNA evidence: upload your raw DNA to GEDmatch.com (free tier) and FamilyTreeDNA to access matches across different testing company databases.

Breaking Through Brick Walls: Six Advanced Strategies

1. Cluster research — research all known relatives, neighbors, and associates of the target ancestor. Families migrated together; neighbors in 1880 often came from the same county in 1860.
2. FAN club — Friends, Associates, and Neighbors often appear as witnesses on deeds and wills, godparents on baptismal records, and informants on death certificates.
3. Two-step migration — many immigrant families stopped in one location before their final destination. A German immigrant in Ohio in 1870 may have arrived in Pennsylvania in 1855.
4. Maiden name search — search for the woman under her maiden name in all records before marriage, not just after.
5. Negative evidence — if an ancestor disappears from census records without a death record, check prison records, state hospitals, and almshouse records.
6. DNA triangulation — if three or more matches share the same DNA segment, they likely share a common ancestor pair. Map the segment to identify which ancestral couple it comes from.