Lapp Family Genealogy Forum
The 1850 Census for Stephenson County, Lancaster, IL lists Martin and Sarah living next to the families of Martin Lapp and Samuel Lapp. They live with Sarah's parents.
Biographical Sketch from the book History of Stephenson County, Illinois, 1880.
"Martin S. Lapp, farmer, Sec. 35; P.O. Dakota; born near Black Rock Ferry, Bertie Co., Upper Canada, December 26, 1826, in 1841, he came to Ogle Co., Illinois; thence, after a year's residence, came to Stephenson Co., in 1842; has a fine 80 acre farm with a good residence and other buildings. His religious preferences are with the German Baptist Church; his politics, Democratic. He was married, in 1849, to Miss Sarah J. Kryder, daughter of John Kryder, an old and honored citizen of Dakota Township."