While the picture below could have been taken in the studio, it was actually shot in the client's home.  In many cases, particularly with young children this is advantageous as they are more comfortable in that environment.  For this image, I positioned the clients several feet in front of a clean white/neutral colored wall.  I used two SB900: one to light the background and one to light the subjects.  Both were pointed through an umbrella and triggered with a PocketWizard MiniTT1/AC3 and Flex5.  I adjusted the background to be about 1.5 stops above the foreground lighting.  Camera settings were ISO 200, f7.1, 1/160 @ 48mm with a 24-70mm f2.8 lens on a Nikon D700.