A tale of two siblings

[Johnnie] was at the CMM computer, showing his assistant how to perform a moderately easy first-piece inspection. This was going to take up most of the morning, but the assistant had to learn. Johnnie thought he would be getting to his emergency reverse-engineering job by mid-afternoon. Of course, all that changed when [Ed McGravy] himself walked in demanding a custom report for the very same omnipresent, persnickety aerospace customer Sleuth had run into the day before.