Taking a quick look at my database, I show Joshua Nichols and "Mary A." Youree married 1835, but I don't have any record of them (as in census records) after that.I do have a note in the file that there was a record Cannon Co. Mar. 1850 for a petition to sell Joshua's land to someone named Hare.
Mary (Martha?) Youree Nichols was a daughter of Joseph Youree/Roseanna McSpadden, I believe.