See the 1870 Federal census for Mt. Pleasant, Scotland County, Missouri. There you will see William (W. C.) and Eber (E. L., born 1858) listed together.
The Scotland County Clerk can be contacted at:
117 S. Market St., Memphis, MO 83555 (660) 465-7027. The clerk has birth and death records for that county from 1883 to 1889. The clerk of the circuit court there has divorce and court records and the probate judge has probate records from 1841.
These Daltons are not part of my family and I am not doing research related to them or any other Daltons. This is merely an assist..