Johann married Laura Emilie Augusta Louise Kidde Abt 1876, Danmark. Laura (daughter of Lauritz Henriksen Kidde and Anna Frederikke Emilie Hammerich) was born 16 Feb 1858, Kobenhavn, Kobenhavn, Denmark; died 1938, Kobenhavn, Kobenhavn, Denmark. [Group Sheet]

1. Johan Theodor Carl Westermann was born 3 Jul 1878, Danmark; died Abt 1908, Danmark.
2. Julie Ida Charlotte Westermann was born 1 Jun 1880, Of United States; died 8 Oct 1957, New York City, New York, United States.
3. Harriet Louise Westermann was born 6 Mar 1882, Danmark; died Abt 1904, Wales, England.