Ken,
Welcome to Rootschat.
1900 US Census for Greenport, Southold, Suffolk, New York done 16 June [Series: T623 Roll: 1166 Page: 238]:
Christian, b. July 1870, 29 yo, married 4 yrs, b. New York, parents b. Germany. HisOcc: Marine Fireman. Renting home.
Kate, b May 1876, 24 yo...b NY, parents b Germany
Mildred E. b Jan 1898, 2 yo (dau)
Christian, b Feb 1900 (son)
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Unfortunately, there is no 1890 census for US (burned).
Couldn't find any Reicharts in Suffolk Co. in 1880 which might have led to additional info...
Exact same place in 1910 [Series: T624 Roll: 1082 Page: 252], but Kate is now "Katherine E" and son is 10 yr old "Elwood C". Christian is now a painter.
AHA! 1920 [Series: T625 Roll: 1268 Page: 268]
Christian is a Widower living with the family of Philip King, and is listed as a brother-in-law: so presumedly Kate's maiden name is "King". Philip is a 62 yo fisherman. So Kate died between 1910 and 1920.
And now...
1880 [Series: T9 Roll: 935 Page: 516]
same place, Philip is the 22 yr old fisherman son of Lewis (50) and Ella (46) King, he born Wurtemburg, she born Baden. Lewis is a farmer. BUT NO Kate!
I'm going to end this now since it appears to need more work on determining where Kate is in 1880...
Nick