In the book's own words, not ours, with obvious scanning errors fixed. Families often supplied these stories to the publisher, so check key dates.
Born 1833
From The History of Clark County Ohio, (1881)
OSCAR N. STEWART, farmer and stock-raiser; P. O. Springfield; one of a numerous and prominent family of that name in this locality; was born in this township, Feb. 5, 1833. He was the son of John T. Stewart; was brought up upon the farm, and received a common-school education. At the age of 23 he commenced farming for himself’ upon a part of his father's farm, where he now resides, and where he has surrounded and provided himself with all the comforts and conveniences of farm life. In January, 1862, he married Miss Rachel Nichelson, daughter of Andrew Nichelson, now deceased, an early settler and much-esteemed citizen of Harmony Township. Of this marriage, three children survive—Herbert P., Ralph N. and Frank C., all living with their parents, by whom neither pains or means are spared to educate and fit them for the duties of life. To the 140 acres originally owned by Mr. Stewart, he has added from time to time, until his acreage in the vicinity reaches 513, besides 150 acres in another locality, all valuable lands in an excellent state of cultivation. He combines stock-growing with farming, and thus turns the products of the farm to greater account, and thereby enhances his profits.
As printed in The History of Clark County Ohio, (1881). See the original pages. Wording is the original; obvious scanning errors have been corrected, and a few may remain.
Their biographies name Oscar N. Stewart: Frank E. Herbert Stewart (b. 1870) Joseph A. Becker (b. 1847) Perry Herbert Stewart
The printed record stops around 1881. We trace your line from there down to you, with every source cited.