# After him their brothers repaired

"Next to him their brothers repaired the wall" 

# brothers

"relatives" or "fellow Jews." These were probably not children of the same parents.

# After him

"Next to him"

# Binnui son of Henadad, the official

Binnui was the official, not Henadad. These are names of men. 

# Keilah

This is the name of a place.