You have asked for critique so here goes…
I like the composition you have created. The family look relaxed in your company too which is great! I think the image would be nicer with some more colourful clothing?
The image looks to have been shot 1 or 1.5 stops under exposed – this means that the skin tones are incorrect – over saturated and coupled with a warm say 6000 colour balance look a little yellow IMO. There is little detail in the blacks this is a problem especially if these clients would like a large image printed as it will have a large area of blacks lifting the exposure any further reveals the digital noise in the blacks that confirms the original underexposure. The family all have beautiful blue eyes so getting a little more light into them would add some sparkle to the shot.
You have chosen iso 200 at f7.4? by reducing your iso a stop or 2 and opening your aperture you will have less noise in the blacks I think your DOF would still be acceptable for this shot.
Hope this helps