William Stewart 3rd great grandpa on RootsMagic tree.

William was born in 1804 in Allegheny County, Pennsylvania. In 1833 or so he married Elizabeth Crooks also of Pennsylvania. William and Elizabeth had 2 daughters and 5 sons. They stayed in Pennsylvania until at least January 15, 1852 when their youngest daughter Elizabeth Stewart, mom of Harve Speedy, grandma of Elizabeth Speedy was born.

On the 1860 census the family was in Jefferson, Green County, Wisconsin. They lived on a farm. On any census recording occupation William was a farmer. Their neighbors were also farmers, most from Pennsylvania, a couple from Ohio, Ireland and New York. In 1860 sons Thomas, William, James and Jeffrey and daughter Elizabeth were with their parents. Oldest daughter Mary -in the photo- was married to William Royer and oldest son John was married to Martha Graham, all lived and farmed in Jefferson, Wisconsin too.

On the 1870 census William was in Shell Rock, Iowa with wife, daughter Elizabeth and son James. William was still farming. All of his children, spouses and grandkids stayed in Shell Rock or the Butler County area except youngest son James – in the photo- and his wife Anne Elliot who went further west to Nebraska. In 20 years time William and Elizabeth traveled at least 700 miles across the country, maybe common today, but in their time kind of incredible. William died at age 70, in 1874 and is buried at Riverside Cemetery in Shell Rock. There are 25 Stewart memorials in Riverside Cemetery, of those 15 are proven in this same Stewart family, the remaining 10 may be somehow related.

Sources
1850, 60, 70 and 1900 US censuses at FamilySearch.
Google map, Allegheny County, PA to Shell Rock IA
Find a grave memorial https://www.findagrave.com/memorial/83687033