There is an Otto Deutsch in the 1920 census in Chicago, living with his parents, John age 45 and Katherine age 47, and his sister Johanna, age 14. Otto and Johanna list birthplaces as Illinois. John says he emigrated in 1892, naturalized in 1898; Katherine emigrated 1892, naturalized 1898.
I find John, Katherine and Johanna in the 1910 census in Chicago, but Otto is not with them.
What makes you think your Otto was born overseas?