His first wife was Maria Catharina Gertrud Schlarmann who he married May 14, 1841 in Germantown.
They had 3 children all born in Germantown and baptized at St. Boniface Catholic Church.
Catharina born/died in 1842.
Their first 3 children were born there in Germantown: Heinrich in 1853, Bernard in 1856 but died before 1858
Bernhard born Aug 1858.
Their next child August Heinrich was born in St. Augusta.
Elizabeth (1843-1936)
2nd Catharina (1846-1917)

His wife Maria died in Germantown April 26, 1851 and he subsequently married Maria Gertrud Kiffmeyer there in Germantown at St. Boniface Catholic Church May 18, 1852.
Henry and his family wife Gertrude, Catherine, Henry and Barney are living in St. Cloud on the 1860 census (listed as Henry Landeshaw).

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"Henry Landwehr was born in Germany, of an excellent family, his father being possessed of considerable means. He received a good education, and as a young man entered the Germany army. At the completion of his service he returned home, and found that his brother had squandered the family fortunes. Thus reduced in circumstances, he and his father were compelled to work at such labor as presented itself.

At the age of twenty-four years, Henry Landwehr came to America. For a time he farmed near St. Louis. In 1859 he came to Stearns County, and located in St. Augusta township, where he purchased 160 acres from one of the early settlers. On this tract he farmed until his death in December, 1881. His widow lives with their son, Henry, in Portland, Oregon."

~ Excerpt taken from "History of Stearns County Minnesota" by William Bell Mitchell, 1915 (Vol. 1, pg. 686)