Diane,
Sorry, I can't find anything on Clem, Evaline or Chesley. I did find this:
1850 Census of Prince Edward County, Va, dwelling #743
Tho C Biasy, 30, Carpenter, birthplace unknown
Jane Biasy, 25, Lunenbg, (Insane)
Ann Biasy, 10, Lunenbg
Liberty Biasy, 7, Lunenbg
Tho Biasy, 5, Lunenbg
Could the initial "C" stand for Clem? Tho also owned two slaves, a 20 year old female and a 0ne year old male.
I am not connected to this family in any way, but I am availble to do research in Prince Edward or Lunenburg. contact me at bill23923(at)gmail(dot)com