Who are these kids?

 
Supposedly these are all Wilbur children. If so then it would seem they would have to be as follows:
 
1. The girl in front would have to be Nellie (about age 6) ... so the year is about 1895 (living in Wichita).
2. The infant would be Samuel (age 2+).
3. The boy on the right would be Roy (age 9).
4. That would leave William as the boy on the left (age 13).
5. Note: Robert (b. 1879) died in 1888.
6. Note: Paul wasn't born until Dec. 1895.
photo courtesy of Corabelle Reuber