I'm just going to be blunt. Nothing personal against you, but your I initial question is extremely ignorant. I am sorry. I still can't figure out how one can come to that sort of conclusion, not to mention "as a pro"?????
Do you not know that it is the person behind the camera that takes the picture? So if you see a picture that is not tack sharp, do you not automatically think that that is the user? I mean when I see a less than "tack sharp" picture or pictures posted anywhere that were taken with a dslr I just move on to the next one without ever having that thought cross my mind. Again, I apologise, but this is the most illogical question I have ever seen on a forum. (I wanted to use the word "stupidest" but don't mean to sound mean)

My nephew asked me to take some family pictures for him.

I have searched on this site and others about family photo shoots but I would really appreciate any tips or do's and don'ts Here are the details:

2 adults and 2 children, a newborn and 2 year old.

I am hoping to do this outdoors... I am not great at indoor lighting etc.

I have a D7000, 24-70 2.8, 70-200 2.8, 18-200 and a 50mm 1.8 etc.
Tripod, sb900 (barley know how to use), remote shutter release, reflector and a Gary Fong diffuser.

Any advice would be great..thanks!

Having shot hundreds of team photo's I can tell you it's virtually impossible not to do boring! So your use of the Jungle Gym is inspired - nice work! But now I'll tell you how I believe it could have been stronger. By getting up higher (a ladder provided by the school's maintenance staff) you can a) reduce the problem of the faces towards the back being hidden by those in front, and b) if it's high enough, put all the faces more nearly into the same plane, reducing the apparent size difference.

But, like I said, Nice Job!