I don't know if I have anything new for you, but this is what I have so far on Christian and Maria:
1880 Rice, Sanducky, OH
P. 14. Jacob Smith family,
Christian Yunker/servant/26/Lorraine/Lorraine/Lorraine/farm laborer
P. 12 Mathias Leatherman family,
Magdalena Swigler/20/ boarder/servant/Baden/Baden/Baden
Marriage: Sandusky Co, OH. 5 Aug 1880. Christian Yunker & Maria M. Schweigle
Stella E Younger b 4 Feb 1881 Fremont, Clay Twp, Sandusky, OH
Mary Etna b 4 Dec 1886 Clay Twp, Sandusky, OH
William Frederick b 21 Dec 1890 Fremont, Sandusky, OH
Harry Ludwig b 20 June 1894
Children identified in Christian's probate (18 Mar 1900):
Marie E Yunker dau
William Yunker son
Harry Yunker son
1900 Fremont, Sandusky, OH
Younger, Leaney/head/40/wd/bJuly 1859/5 born 4 liv/Germany/Ger/Ger/Imm 1866/ 34 y in U.S.
------ Marry/dau/?Sep 1887/12/OH/Ger/Ger
------ William/son/Dec 1890/9/OH/Ger/Ger
------ Harry/son/June 1895/5/OH/Ger/Ger
Marriage 17 Apr 1907 Sandusky OH John Dietrich & Lena Yunger
Lena b 1860 Germany. Father Jacob Swangler Mother Katherine Leatherman
John's residence listed as Old Fort, Seneca co, OH
Oakwood Cemetery, Fremont, OH
Christian Younger. 1849-1900
Magdelena, his wife, 1859-1844
I have several newspaper articles regarding the death of Christian Yunker in March 1900. No parents were mentioned, nor were his wife and children named.
I do believe Christian Yunker is the Christian listed with my grgrandfather on this ship passenger list:
Ship Calabria, arr NY 5 Oct 1872
Ludwig Junker/16/m/labr/Germany (Louis in America, my line)
Julia Junker/3 mo/infant/Germany
The Yunker clan has been difficult for me. I have nothing identifying Christian or Louis's parents. I have identified some family ties through location, mentions of niece, nephew, some naturalization and guardianship records. I'm even sure of the exact relationship of the Junkers on the passenger list. I found Christian's children married and living in Michigan in later years.
I can do have more on the Yunkers if you want it. Louis and Henry (Heinrich) ended up in Kansas. Adam (John Adam) was also in Kansas around 1900 but returned to Ottawa Co, OH in later years. Christina married John Balduf and lived in Ingham Co, MI. Jacob lived in Ottawa Co, OH for most of his life.
Does any of this sound familiar?