Joseph Chaplin was the son of David and Mary (Bradstreet) Chaplin. He married Lois Hastings in Lunenburgh, April 5, 1764, the daughter of Nathaniel Hastings and Lois Houghton. He lived on the southern slope of Flat Hill.

According to "George A. Cunnigham's Genealogical History of Lunenburg, MA.", ca. 1875, it lists Chaplin's burial site as " He d. (S) " (Lunenburg MA's South Cemetery). There aren't any markers or listings for Chaplin's in the current town burial records.
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In the "History of Westminster…" by William Sweetzer Heywood,

page 102
"In the company of James Reed, raised March, 1762, were Elijah Sever, Joseph Horsley, Jr., Benjamin Horsley, Joseph Miller, Josiah Sever, William Stedman, Josiah Wheeler.

In the company of the same captain, Bemjamin Ruggles' regiment, without date, were Joseph Bailey, Jedediah Cooper, JOSEPH CHAPLINE, Andrew Darby, Jr., Joseph Horsley, Edward Joyner, Gideon Fletcher, Jonathan Stedman, William Stedman."
– French and Indian War
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"Intentions of marriage between Joseph Chaplain and Lois Hastings both of Lunenburg was entered Decr 10th 1763" –
Intentions of Marriage Copied from the Original Records Of the Town of Lunenburg & Embracing all the intentions of marriage contained In Vols I. & II. Transcribed by John R. Rollins 1847-8

Marriage:
"Joseph Chaplain & Lois Hastings both of Lunenburg were
Married by Edward Hortwell ?? Esqr: April 5th 1764" from the Town of Lunenburg, Minutes Report Town Clerk Records 1720 – 1763

"Massachusetts Soldiers and Sailors in the War of the Revolution in the War of the Revolution, Vol 3" by Secretary of the Commonwealth, 1897, page 323 & 324
"Chaplin, Joseph, Lunenburg. Private, Capt. Robert Longley's co., Col. Asa Whitcomb's regt.; muster roll dated Aug. 1. 1775; enlisted April 29, 1775; service, 3 mos. 10 days; also, receipts for wages for Aug. and Sept., 1775, dated Prospect Hill; also, company return [probably Oct., 1775]; also order for bounty coat or its equivalent in money dated Prospect Hill, Nov. 20, 1775; also, list of men enlisted into Continental Army from Capt. David Carlile's co., 8th Worcester Co. regt., dated Jan. 9 1778, as returned to Col. Abijah Stearns; residence, Lunenburg; enlisted for town of Lunenburg; joined Capt. Smith's co., Col. Bigelow's regt.; enlistment, 3 years; also, Capt. Sylvanus Smith's co., Col. Timothy Bigelow's (15th) regt.; Continental Army pay accounts for service from March 3, 1777, to Dec. 31, 1779; also, muster roll for Jan.-Aug., 1777, dated Van Schaick's Island and sworn to in Camp at Stillwater; enlisted March 3, 1777; reported sick at Lunenburg; also, muster roll for Nov., 1777, dated Camp near Gulf; reported sick at Fishkill; also, muster roll for Dec., 1777, dated Camp Valley Forge; reported sick at Fishkill; also, muster rolls for Jan.-May, 1778, dated Camp at Valley Forge; reported sick at Fishkill; also, muster roll for June, 1778, dated Camp Greenwich; also, muster rolls for July, 1778-June, 1779, dated Camp Providence; reported on command at Greenwich in Dec., 1778, also reported a wagoner in May and June, 1779; also, muster roll for July, 1779; reported a wagoner; also, muster roll for Aug., 1779, dated Camp at Salem; reported acting as wagoner; also muster roll for Sept., 1779, dated Bedford; reported a wagoner; also, muster roll for Oct., 1779, dated Camp Peekskill; reported a wagoner; also, muster roll for Nov. and Dec., 1779, dated Highland; reported tending horses; also, Capt. Smith's co., Col. Bigelow's regt.; Continental Army pay accounts for service from Jan. 1, 1780, to March 3, 1780; also, muster roll dated West Point, March 27, 1780; also, muster roll for Jan.-June, 1780, dated Camp Robinson's Farms; reported discharged March 3, 1780."
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Joseph and Lois children:

Original A Second Book of Records 1736 – Bought 1786
Book of Records of Births Deaths and Publishments, Westminster, page 57:

"April ye 3rd 1765 Joseph Chapline & wife Loes
Sone Jonathan Bradstreet Chapline Borne"

"October Ye 30th 1766 John Son of Joseph and Loes
Chapline Borne"

"April 27 1768 Achsa Chapline Borne"
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Town of Lunenburg, Minutes Report Town Clerk Records
1720 – 1763:

"George Washington Chaplin Son of Joseph Chaplin
& Lois his wife was Born at Lunenburg May ye 11th 1777"

"Samuel Chaplin Son of Joseph Chaplin & Louis his wife
Born at Luneburg December 31st 1779"

"Lois Chaplin Daughter of Joseph Chaplin & Lois his
wife was Born at Lunenburg November 10th 1781"

"Anna Chaplin Daughter of Joseph Chaplin & Lois his
Wife was Born at Lunenbur September 3d 1785"

"Susanna Chaplin Daughter of Joseph Chapline & Lois
His wife was Born at Lunenburg august 23rd 1788"
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Town Meeting Minutes, with Births, Marriages, and Deaths, Lunenburg, pg abt 570:
"A List of Persons Warnd out of Lunenburg by order of the Selectmen. And a return made by the Constable to the town In February one Thousand Seven Hundred & Ninety one….
Names: Joseph Chaplin, Addition: Laborer, Wives: Lois,
Their Children: Permela, George Washington, Samuel, Lois, Susanna, Anna
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"George A. Cunnigham's Genealogical History of Lunenburg, MA.", ca. 1875, pg. 129 list of children:
Parmela b. warned 1791
Child b. d. 24 Feb. 1776 (S) Z. Adams interleaved almanac.
Child b. d. 27 May 1776. 8 (S) Z. Adams almanac.
George Washington b. 11 May 1777 P.t. 1799
Samuel b. 31 Dec 1779 warned 1791
Lois, b. 10 Nov.1781 warned 1791
Anna b. 3 Sep 1785 warned 1791
Susanna b. 23 Aug. 1788, warned 1791
note: (S) indicates South Cemetery
Z. Adams indicated Rev. Zabdiel Adams minister of the church in Lunenburg from 1764 to 1801