Frache/Lorenz of Schlesien

I am researching my ggrandfather Ernst Manuel FRACHE was lived in Gaablau, Kreis Landeshut, Schlesien, Germany from 1867-1889. He was born in 1835, but I have not been able to locate his place of birth. Family tradition says the family originated in Alsace-Lorraine. Does anyone know of a way I can trace Ernst back to Alsace-Lorraine from Schlesien? His spouse Magdalena Johanna Anna Lorenz was born in Berthelsdorf, Kreis Landeshut, Schlesien in 1848. I have not been able to locate their marriage certificate or info either. They would have been married sometime around 1867. Any ideas are welcome.

Norma Closson
This too shall pass