I've always been surprised...
....that airlines permit family on the flightdeck. Putting aside the Aeroflot airbus case as a stupid outlier, and recognising that even in some fairly spectacular incidents (such as VH-OJH Bangkok) the incident reports have almost always denied a causal link between family on the flight deck and the incident (eg VJ-OJH "there was no evidence to indicate that the presence of the second officer’s wife on the flight deck adversely influenced any aspect of the flight") I still find it hard to believe that its not a distraction. Bad enough having the wife in the car.....
Pinkman