The following was on the Find-a-Grave site for John Wallace (https://www.findagrave.com/memorial/43363939/john-wallace)

 John Wallace, who in 1770, with three brothers (see below) emigrated from Londonderry, Ireland, and settled in Carlisle, Pa., he married and had one son, William, who was reared by his grandparents. John Wallace, after the death of his wife, returned to Ireland and married a Miss Crawford, a sister of Mrs. John Scott , well known in the pioneer days of Beaver county. He remained near Londonderry until his children, six in number, were born, and in 1797 returned to America and settled in Cecil county, Md.

Oldest Son:
1. William Wallace married a Philadelphian and reared a large family, from whom came what are known as the Carlisle Wallaces. Ex- Governor Wallace , of Washington Territory, is one of that family. Gen. Lew Wallace , who distinguished himself in the War of the Rebellion, and late Minister to Constantinople, is another. Dr. Wallace, of Springfield, Ill.; and Ex-U.S. Senator William A. Wallace , of Clearfield, Pa. are also of this family.

Brothers:
1. William, located in Goshen, N.Y., and many of his descendants, a number of whom occupy prominent positions, still reside in that city and New York.
2. James, settled in Philadelphia, and from him spring many of the Wallace families in the eastern part of the state.
3. Hugh, went to South Carolina, where there is today a large connection.