This material is from the old "History of Greene County", p.657:

Joel Swigart, farmer, Bellbrook, was born in this township, on section 4, in the year 1820, and is a son of Michael and Sarah (Nave) Swigart; the former was born in Somerset County, Pennsylvania, in the year 1787; he was a son of Peter Swigart, who with his family came to Ohio in 1808, and located in Beaver Creek Township. Peter Swigart was born in Germany, and upon landing in America was sold to a planter to pay his transportation. He was father of six children, who came with him to Greene County, in which they made homes, living here till their, decease. Peter died about the year 1839, aged eighty-two years. She departed this life in 1827 at an advanced age. They were life members of the Lutheran Church. Michael Swigart, father of our subject, was twenty-two years old at the time his father came to Ohio, and about two years after was married to Sarah Nave, who bore eight children, of whom four are living, Michael, Solomon, Joel, and Barbara Huston, nee Swigart; the deceased are David, Elizabeth, Martha, and Sarah. After his marriage he located in Sugar Creek Township, as before described, making a permanent home here till his decease, which occurred in February 11, 1869, aged eighty-three years. She departed this life about 1836, aged thirty-nine. They were life-long members of the Lutheran Church, and were much interested in religious matters, he serving his church in the capacity of elder and deacon for many years. Politically he was Republican. Our subject was reared on the farm, and received an ordinary education in the district schools. In 1843 he was married to Margaret Huddleston, daughter of John and Eva Huddleston, of Beaver Creek Township, who bore him five children, three of whom are living, Sarah J., Mary C., and Elmira.. The deceased are Elizabeth A., and Ida B. Mrs. Swigart died in 1878, aged fifty-three years. She was born in this county in 1825. Her parents came here in an early day, living and dying where they settled. She was a member of the German Reformed Church, to which she had been connected for several years, and was a very exemplary woman. After their marriage they located on the place where he now lives and has since resided. He owns one hundred and seventy-seven acres of land, mostly in cultivation and well improved, making a pleasant home. He is connected with the German Reformed Church, of which he has been a member for a number of years. Politically he is a Republican.

The history covers several of the children of Peter's son Michael, including this Joel -- I'm interested in discovering the rest of the six (alleged) children of this Peter Swigart.

Thanks for anything!