And then.. there he was.

My Great-Grandfather. On the 1920 Census he was still using his birth name. I am in awe if the skill of experienced genealogists. I know what I want to be when I grow up.

OK, I was finally able to find them in the 1920 Census:

Ward 21, Detroit, Wayne Co., Michigan

Stivic, Zivko, Head, aged 32, married, emigrated 1912, alien, b. Croatia, parents b. same, machinist, auto factory
Stivic, Marianne, Wife, aged 26, married, emigrated 1912, alien, b. Croatia, parents b. same
Stivic, Bozidar, Son, aged 7, b. Michigan
Stivic, Felix, Son, aged 4 years, 0 months, b. Michigan
Stivic, Engelbert, aged 2 years, ? months, b. Michigan
Stivic, Gabriel, Son, aged 5 months, b. Michigan

His WWI draft registration card gives the following info:

Zivko Stivic (Stevens), aged 30, of Maryland Avenue, St. Clair Heights, Michigan, born 17 September 1886 Lipovac (Croatia), Austria-Hungary; has wife and two children as dependents. Dated 5 June 1917 at Wayne County, Michigan

They arrived into New York aboard the Saxonia on 5 June 1912 out of Fiume:

Stivic, Zivko, aged 26, labourer, b. Hungary, German, last of Vodinci(?); gives his mother, Anna Landekic of Vodinci as next of kin; bound for Michigan, born in Lapovac
Stivic, Marianne, aged 19, b. Hungary, German, same info as above

They are joining an acquaintance, Anton Kocianu(?) of 32 Hendrik Steet, Detroit.