As a working 'budget' prof photog (using the scenario in which you wrote about earlier...economic and simple), I'd charge the following (working pro in real life).
Sitting fee $50-$75
(if local, $50. If more than a 30-min drive, $75.)
This fee will gaurantee (that I show/you show) multiple poses and qty of 2 custom lab quality, archival 5 x 7 reprints
which you'll be 100% satisfied. $25.
(w/ rights to do your own unlimited reprint) $15.
The DVD would have the option of files with diff compression/quality so that you could either send/post in email/online or provide a file with max resolution so you could print your own 8x10 in excellent quality.
So if I were that local struggling photog total, I'd charge $90
. If not so local, $115
. However, with their charging $60 you're getting a good deal and if they have a business card, you could talk up their business to local friends as an added way of repayment for giving you the great discount.
BTW, an off-camera flash is of good use as an alternate to existing light portraits; however, the photog should use a diffuser and have a flash bracket for off camera use. With flash mounted on the camera, the result is often non-flattering portraits - especially with groups portraits. I'm not saying you can't get good results at all but often the on-camera flash creates stark or harsher looking pics. Using a good diffuser makes people look natural. Also, using a nice large reflector that provides a warm color back at the subjects - like a gold reflector is ideal with the winter light. White relector are neutral abnd can make thing a bit too drab or worse slightly blue if using the light from windows. Silver reflectors are not good for family portraits as that is more for fashion and bridal shots as they can create specular highlights (splashy higfhlights). Slightly warmer (not shiny) gold is ideal.
Your budget photographer should be prepared/equipped this way and most likely knows this. Otherwise, you can take a fine portrait with a self-timer. The good thing about using digital cameras is you can edit as many times as you'd like without wasting film.