My great-great-grandmother's sister Clara Matilda Borg and her husband Nils A. Samuelson never had biological children, but they raised a girl, Etta Maria Carter, and a boy, Leroy G. "Roy" Johnson.
1910 United States Census, Westchester Township, Porter, Indiana, population schedule, enumeration district 152, page 9A. Available from Ancestry.com. 1910 United States Federal Census [database on-line]. Provo, UT, USA: Ancestry.com Operations Inc, 2006.
1920 United States Census, Westchester Township, Porter, Indiana, population schedule, enumeration district 157, page 4A. Available from Ancestry.com. 1920 United States Federal Census [database on-line]. Provo, UT, USA: Ancestry.com Operations Inc, 2010. Images reproduced by FamilySearch.
The Vidette-Messenger, 20 March 1934, page 2. (The name of the daughter is listed incorrectly.)
My 3rd-great-grandfather's brother John G. Gatlin and his wife Martha Ann Gower legally adopted a little girl, Tennessee Reed (Minnie Gatlin after the adoption), in 1874.
Miller, Alan N. Nineteenth Century Tennessee Adoptions, Legitimations, and Name Changes. Baltimore, MD: Clearfield, 2009. Page 51.
The girl's biological parents reconciled after the adoption had approved, and wanted her back. The Davidson County, Tennessee Circuit Court ruled that it was in the best interests of the child for her to remain with her adoptive parents. The below excerpt from an article in the Nashville Union and American, 3 December 1874, shows that the adoptive mother and daughter had formed a close bond.
Nashville Union and American, 3 December 1874. Available from Chronicling America.
My great-grandmother Kathleen (Graham) Mapplebeck Boe was the biological daughter of James Graham, but when her mother Catherine Elizabeth Winters married James Mapplebeck, she took his name and he became her father. The adoption may have been informal rather than legal, but Kathleen's application for a Social Security account shows that James Mapplebeck was the man that she considered to be her father.
Kathleen Graham Mapplebeck Boe, SS no. 494-07-1459, 11 December 1936, Application for Account Number (Form SS-5), Social Security Administration, Baltimore, Maryland.