1826, June 19 — Charles Loring Brace born in Litchfield, Connecticut, to John Pierce Brace and Lucy Elizabeth Porter (Harriet's sister). This makes Harriet Porter Beecher, wife of Lyman Beecher, the aunt of the future founder of the Children's Aid Society and architect of the Orphan Train program.
Source: The Life of Charles Loring Brace, Chapter I, p. 1.
1826 — Thomas Kinnicut Beecher born (third surviving child of Harriet and Lyman). Thomas would become a progressive Congregationalist minister in Elmira, New York.
1826 — Publishes Elements of Logic, which revives formal logic as a serious academic discipline and becomes a standard textbook for generations.
Source: Full text available at Internet Archive — https://archive.org/details/elementsoflogicc00whatuoft
Quote: "Richard Whately (1787–1863) is better known for his influential defense of logic than for adding anything to the formal core of the subject." — ScienceDirect, Richard Whately and Logical Theory.
1826, February 28— Mother Charlotte Law Hull Olmsted dies, leaving John Hull and Frederick as young orphans of their mother; father remarries Mary Ann Bull in 1827.
Source: Library of Congress, "The Olmsted Family" — https://www.loc.gov/collections/frederick-law-olmsted-papers/articles-and-essays/the-olmsted-family/
Quote: "Charlotte Law Hull (1800-1826)… The young mother of two died due to an overdose in 1826."
Delivered his landmark sermons on intemperance before his Litchfield congregation during the height of the Second Great Awakening. Co-founded the American Temperance Society the same year.
Source: Connecticut History, "Hope for the West: The Life and Mission of Lyman Beecher"
Quote: "Intemperance is the sin of our land, and, with our boundless prosperity, is coming in upon us like a flood; and if anything shall defeat the hopes of the world, which hang upon our experiment of civil liberty, it is that river of fire which is rolling through the land, destroying the vital air and extending around an atmosphere of death."