Of the three men, only the eldest, Johann Jakob, was married at the time of the 1798 census. Any of them could have fathered a child born in 1803.
Their parents were Chrisian Laas, also spelled Lass, and his with Katharina from Mecklenburg, Klauswetz, Germany. At the time of the census in 1767, Johann Jakob was four weeks old.
When I confirm which brother he was, I will update this profile accordingly.
Sources
Mai, Brent Alan; 1798 Census of the German Colonies along the Volga, Volume 1; American Historical Society of Germans from Russia, Lincoln, Nebraska; Published 1999 and 2005; page 662, , Johann Jakob Laas, age 31, Johann Heinrich Laas, age 26, his brother, and Johann Christian Laas, age 20, also his brother.
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