Well, you probably want lots of detail and, dependently on the result you might want to try and add a bit of analog like noise in PP, as it tricks the viewer into the illusion of seeing more fine detail.
Your lens is sharp enough, from what I see from friends that have it.
Just, dependently on how large the family is you might need to be quite distant with that focal lens.
Personally I would resize before uploading to keep an eye on the results and correct things locally, in case some areas of the image risk to fall apart.
You might want to have a look into specialized software if you are concerned about quality loss. Genuine fractals used to be very highly regarded, but I am not sure how well it fares with with human features.
As for how to take the photo, I think it really depends one the family. Perhaps you can include the family house or some other place/thing that means a lot for you all?
My mum loves cats and her seaside house, I think she would readily prefer a badly exposed image there with her favourites than a perfect portrait without them, for instance :)
I am not familiar with US services, but for an expensive print perhaps you could check if they offer printing profiles for soft proofing, if you didn't get them already.
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