Matilda Swank m. Mark Kinnison 1835 IN

I am a Kinnison descendant and was hoping that a descendant of the Mark Kinnison and Matilda Swank union may be able to offer some clues. Mark b. abt 1810 married Matilda in La Grange Co. IN 26 Nov 1835. I wasn't able to find them in that county in the 1850 census. Mark had siblings Charles, Ruth who m. David Rhea, Davis, Elizabeth who m. Isaac Edmiston, Archibald who m. Charlotte Wood, Nancy who m. Wm. Gibson and Hiram who m. a Catherine. Their parents were Mark Kinnison b. 1777 and Nancy Davis b. abt 1783. Several of these Kinnison's lived in La Grange Co. or Elkhart Co. IN area.