Absolutely, I agree with breaking up the set.
3-piece classic sofa sets are practically a thing of the past -
If you really spent $7000 on those 3 pieces, then consider that you could "class-up" 2 rooms by using those pieces, getting the most bang for your buck.
that living room is much too small to hold a large 3 piece sofa set - it will look crammed. Walk through rooms are really only avoided in 43', 46' and wider lots.
All that aside, I know you are eager to move in, but just wait until then.
If you're spending $7k on somewhere to sit, you can clearly spend a few hundred on a design consultant?
I know quite a few if you'd like a referral.
PErsonally, what I would do is eliminate the living room altogether.
Make a statement with a huge but narrow 16-20 seat dining room set, running it lenghtwise. You don't need a 'living room' especially since you have a family room AND a 2nd 'family room' upstairs. (Unless you have 12 kids

)
In our house, we put in a long dining table, with just two stylish chairs at the bottom of the 'living room' section just to define the space.
When we have big parties, we throw in a 2nd table and can fit 25+ people in the one room - best fits our needs.
Really, you're not giving us a lot of information to be able to really help you out. Regardless, everything will work out fine.