On the 1850 Brown Co. Washington Twn. Census there is: John Purdum age 29 Nancy"age 35 ( Hamilton known maiden name) John"age 16 Semarimas"age7 ( could be 9 hard to make out) Samantha J."age5 (hard to make out on old copy) Joanna W."age2 William J. "age 9/12 mo.
On the 1860 Illinois McClean Co. Twn. there is found on GenForum, McClean Co. message 262 found the John Purdum family including Samarimus 18, F. Ohio.So, it would appear the family moved to Illinois sometime in the 1850's.