Thanks, @Dan Cornett, but your analysis is not quite correct. Sydney J. Rosenfeld Steiner DOES have known parents. They are Irene Gross Rosenfeld and N. N. Rosenfeld. (He was not illegitimate; his father died when he was young and we simply have not found the Hungarian and American birth, marriage, or death certificates of his father.) Sydney was bon in the USA.
Meanwhile, Geza Steiner, who was born in Hungary, came to America with his bride (first name also not known) and they had two children, Charles B. and George, who were born in America. One was almost the same age as Sydney Rosenfeld.
Geza's wife died.
At that point, Sydney was living with his mother Irene Gross Rosenfeld and grandmother Annie Gross, while Geza, a widower, was living with his two sons, Charles B. and George Steiner.
Then Irene and Geza married. Sydney added the last name Steiner but kept his original surname Rosenfeld as a middle name. Irene took the surname Steiner and adopted Geza's two boys, while Geza adopted Sydney.
Then Geza died (almost immediately, strange to say) and in the next Federal census, Irene was listed as the mother to Charles B. and George, not as heir step-mother, although she was not their biological parent.
Charles B. and George, the biological Steiner brothers, grew up and left home, and Sydney stayed with his biological mother Irene and his grandmother Annie, off and on, for the rest of their lives.
If the software can not handle this adoption situation, i shall ask for a conventional step-parent relationship to be shown, and i will explain the two-way adoptions in the comments field. That would be preferable to the mess we have now1
Thanks for any help!