Wow. Thanks, Tom. I have been thinking Fidelius and Joe might have been brothers, but this is the first clue there's some substance to it. I have been at square one on my mother's parents for four years, which makes doing the genealogy a bit tricky.
The one problem: Joe was living in Utica in 1930, according to the U.S. Census. But he settled in Syracuse, and his daughters were born in Syracuse (1902, '04). He worked for the NY Central Railroad, so until he retired his real home was the caboose.
He listed his immigration date in that census as 1882, so that jibes. He would have been 7, and Fidelius 14. So being brothers is possible. There couldn't have been that many Seeburgers in Syracuse, as I have never been able to find another other than Melchior Seeburger -- who lived and worked with Fidelius, according to the 1889 city directory. Another brother? Cousin? Next stop: Holy Trinity Church. Thanks again, Tom.