John Sly (1763–1868) was born in Oblong Square, Dutchess, New York, USA and died in Seeleys Bay, Leeds, Ontario, Canada. 2 researchers on YourRoots have this ancestor in their family trees.

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Right now, 2 researchers on YourRoots have John in their trees. The ancestor migration map traces 10 generations of this lineage.

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Records vary by researcher and can include census, vital, parish, cemetery, and family sources.

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John Thomas Sly 1763–1868

Public Tree Person

What is a Public Tree Person?

A Public Tree Person is an ancestor documented independently by multiple YourRoots tree owners. When several researchers' family histories converge on the same person, we publish a shared page that combines what they've documented.

Why this is a Public Tree Person

Full name consistent across 2 independent trees

Birth year and location consistent across 2 trees

Death year and location consistent across 2 trees

Compare a Public Tree Person with your own tree using Compare Tree.

B Reliability

Reliability Score: B

Medium — based on the source tree

Grade scale

A 3 criteria (Strong)
B 2 criteria (Medium)
C 1 criteria (Basic)

Verification checklist

Record available
Descendant's record available
Star tree owner

2 researchers on YourRoots have John Sly in their family trees — each with their own records and documentation. Trace the migration path across 10 generations. If this ancestor is in your tree too, you can compare what you've found and fill in the gaps together.

Last updated: August 25, 2026 · Reliability: B — verified across 2 independent trees

Born 23 Jun 1763 · Oblong Square, Dutchess, New York, USA

Died 30 Jan 1868 · Seeleys Bay, Leeds, Ontario, Canada

Father Mills Slye

Mother Rachel Bumpus

Siblings Elizabeth Slye, Gideon Slye, James Slye, Lydia Slye Sley, Miriam Sly, Rebecca Sly, Ruth Slye, Zylphia Slye

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Researchers connected through John Sly 1763–1868

and 1 more tree owner connected with John Sly 1763–1868

Immediate Family

Parents

Mills Slye

Rachel Bumpus

Spouse(s)

No spouse recorded

Children

No children recorded

Biography

The story of John Thomas Sly began in 1763 in Oblong Square, Dutchess, New York, USA. John Thomas Sly passed away in 1868 in Seeleys Bay, Leeds, Ontario, Canada.

Sources

Life Timeline

1763

Birth of John Thomas Sly in Oblong Square, Dutchess, New York, USA

Birth

1868

Death of John Thomas Sly in Seeleys Bay, Leeds, Ontario, Canada

Death

Oldest Ancestor Line from John Sly

This ancestor line traces from Halifax, Yorkshire, England (1400) to Oblong Square, Dutchess, New York, USA (1763) across 10 generations.

Direct Lineage

generations

Frequently Asked Questions

: John Sly (1763–1868) was born in Oblong Square, Dutchess, New York, USA and died in Seeleys Bay, Leeds, Ontario, Canada. 2 researchers on YourRoots have this ancestor in their family trees, each with their own records. This page combines what they've independently documented and assigns a Reliability Score (B) based on cross-tree validation.
: Right now, 2 researchers on YourRoots have John in their trees. They're working independently, so connecting with them is a good way to cross-check your records and find things you might have missed. You can also explore the ancestor migration map that traces 10 generations of this lineage geographically.
: It varies by researcher — some have census records, others have marriage certificates, parish registers, or family Bible entries. Scroll up to see exactly what each person has cited.
: Use the "Compare Tree" button on any researcher's profile above. You can compare your tree side by side with theirs, see where your records overlap or differ, and collaborate to fill gaps.

Related Records

John Sly's Ancestors

Pedigree chart — 3 generations on record

Self

John Thomas Sly PTP

1763–1868

Oblong Square, Dutchess, New York, USA