 He opened the first Lithuanian school with his wife in 1918.There was a noted episode during Polish-Lithuanian War, as one of his brothers during ceasefire transferred Tadas' taxidermical collection through the front line into Lithuania.The other three brothers of Ivanauskas identified themselves with the other two nationalities of former Polish-Lithuanian Commonwealth, two ( - politician and engineer and Stanisław Iwanowski - lawyer) chose to become Polish, and one (politician) - Belarusian (although he would live in interwar Poland).