John Belt, III was born in 1703, in Anne Arundel county, Maryland the son of John Belt, Jr. and Lucy Talbot (Lawrence) Belt. Around 1728, John married Lucy McKinsey.  Children of John and Lucy include:
John Belt, IV, married Dinah Lane
Sarah Belt, married Thomas Randall
Richard Belt, born 1735, in Baltimore, Maryland, died 1789, in Baltimore, married Keturah Price, on January 24, 1760
Leonard Belt, born 1741, in Baltimore, died 1808, in Baltimore, married Hannah Parrish, on January 27, 1762
Jeremiah Belt, married 1) May Sprigg and 2) Ann West
Lucy Belt, married John Malone
Mary Belt, married James Petticoat
Joseph Belt, born April 10, 1750, in Baltimore, married Elnora “Ellen” Randall on September 30, 1793
Elizabeth Rebecca Belt, born 1760, in Baltimore, died 1820, in Harrison county, Ohio, married Aquilla Tipton
Lucy (McKinsey) Belt, who was born in 1703, in Maryland, died in 1760, in Maryland and was buried in the cemetery of the Gunpowder Friends Meeting House (The Quakers) in Sparks, Baltimore county, Maryland. John died October 1, 1788, in Baltimore county, Maryland and is buried with Lucy.
In his Will, John mentions the land parcel Aquilla's Reserve, which he leaves to sons Nathan and Joseph. Children named in the will are sons John (named as John Sr.'s eldest son), Nathan, and Joseph, and daughters Sarah Randall, Lucy Malone, and Mary Belt. 
Source: S32 Author: Yates Publishing Title: U.S. and International Marriage Records, 1560-1900 Publication: Name: Online publication - Provo, UT, USA: Ancestry.com Operations Inc, 2004.Original data - This unique collection of records was extracted from a variety of sources including family group sheets and electronic databases. Originally, the information was derived; Repository: #R1
This person was created on 01 July 2010 through the import of mcdougle 2010-06-30.ged
It may be possible to confirm family relationships with John by comparing test results with other carriers of his Y-chromosome or his mother's mitochondrial DNA.
However, there are no known yDNA or mtDNA test-takers in his direct paternal or maternal line.
It is likely that these autosomal DNA test-takers will share DNA with John:
Are John's dates and parents right? It seems unlikely that he was born in 1700 if he died in 1814, and John Sr. and Lucy Lawrence currently have two sons named John who clearly aren't the same person -- not impossible, but unlikely.