Theodore along with his brother Joseph, arrived in Cooke County, Texas in November of 1889. After viewing the location, they liked what they saw. They were the first pioneers to arrive in this new community to be formed. Shortly thereafter, their brother Bernard from St. Louis joined Theodore and Joseph and opened a lumber yard in Muenster.

After Theodore acquired his property east of Muenster, in December 1889, he built a small wood frame house, which would later become the kitchen to a much larger house that would be added. He and his brother Joseph lived there until their sister Anna Marie immigrated to the US in July, 1890. Anna Marie kept house for her two brothers for a brief time until she married August Grube in 1891.

On Sept. 9, 1891, Theodore married Anna Emilie Flusche, the daughter of Joseph Flusche. Theodore's sister Anna Marie and August B. Grube were also married that day in the St. Mary's Catholic Church in Muenster, Texas in a double wedding. To this union between Theodore and Anna, twelve children were born with 4 of the daughters becoming nuns.

Theodore had applied for US Citizenship in Shelby County, Iowa in July, 1889 while he was there briefly. On April 23, 1904, Theodore received his Naturalized Citizenship papers at the Cooke County Court House in Gainesville, Texas, and became a US citizen.
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The Gainesville Weekly Register
Gainesville, Cooke Co., Texas
Thursday, April 23, 1937

JOHAN THEODORE WIESMANN Passes
Muenster, April 21: JOHAN THEODORE WIESMANN, one of the pioneer and highly respected citizens of Cooke County, passed away at his home in Muenster Tuesday, following an illness of several months of heart trouble.

Mr. Wiesmann was born in Bork, Germany in what was known as Muenster land, on July 7, 1864. He came to this country in 1889 and in company with his brother, settled in western part of Cooke County, then a just a prairie. The town of Muenster was named by them.

He was married to Miss ANNA FLUSCHE in 1891 and ten children were born of their union, all of them surviving, as is his wife. They are CARL, AUGUST, and Mrs. A. H. LUEB of Carlsbad, New Mexico, FRANK, TONY and Mesdames JOHN HAVERKAMP and ALOIS FLEITMAN of Muenster, THEODORE of Gainesville, Miss MARY WIESMANN of Fort Worth, and Sister ANN THEODORE of San Antonio.

Funeral services will be held Friday morning in Sacred Heart Catholic Church in Muenster with Rev. FROWIN officiating. Interment will be directed by G. J. Carroll and Son of Gainesville.