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.
From The History of Clark County Ohio, (1881)
MISS SUSAN SINTZ, Springfield; she is the daughter of Peter and Elizabeth (Creitz) Sintz. She lives three miles northwest of Springfield, on the farm which her father entered. In 1858. the year he died, he was preparing material for a new house. Susan. being an energetic lady, pushed the work to completion, erecting a beautiful brick mansion, in which she resides. Peter was a native of Pennsylvania, and came to Clark (then Champaign) Co., Ohio, in 1802. Elizabeth, a native of Virginia, came here (with her sister, Mrs. George Croft) about the same time. In 1803, the same year that Mr. Sintz entered his farm, he built a log cabin (which is still standing), in which he lived until his death. The first preaching that was had in that part of the county by the Methodists was held in this cabin, and the first person converted and to profess religion in that neighborhood was also in that cabin. His name was Jeremiah Sims. When Mr. S. first settled in this county, the Indians were very numerous, and sometimes quarrelsome. On several occasions, Mr. and Mrs. S. were compelled to sleep in the woods. Mrs. S. would sit in the saddle, on the horse, all night, with her babe in her arms. They shared the "ups? and “down” of pioneer life. Peter worked for Robert Rennick in the mill, and, in 1826, built the first lour-mill. He afterward erected two other flour-mills and three saw-mills. Of Peter and Elizabeth's seven children, but four are now living, viz. Mrs. Margaret Leffel, Mrs. Martin Snyder. Peter and Susan.
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.
Named in this biography: George Croft (b. 1771)
Their biographies name Susan Sintz: Michael Rader (b. 1868)
The printed record stops around 1881. We trace your line from there down to you, with every source cited.