For the furniture listed, I really only see one option, which puts one side of the sectional against the floor-to-ceiling window in the front:

The chair shown would have to be moved when the table is pulled out and the other leaf raised to seat six.

I’ve added a few pictures from the room – they’re in a bit of upheaval as they try to complete a number of projects before their little one arrives later this year…

Pic of the space - the only thing they really wanna keep is the TV credenza – everything else can go - I appreciate the feedback so far – looks like a good direction, I’m very concerned about buying a sectional – they seem very polarizing…

I had in mind the same layout as @simplynatural though with a long sofa instead of a sectional to leave the window area more open to the right of the door. You can accommodate a very long sofa. Be sure in this space to purchase seating furniture that doesn't have bulky arms, and is not over stuffed. For the chair, get ones with open wood arms.

I like the flip idea for laying out to watch tv, use a laptop or phone and snacks or more stuff. I think two extra deep couches work for laying if you get the low wide rolled arms you can lay your head against comfortably or use a pillow against. The tv is on the console or mounted on the staircase wall. The super deep couch starts on the other side of the window. Make it as lokng as he needs laying out with his head at the arm. He'll be stretched out looking right at the tv. An extra large ottoman can be close to the far end he can reach when laying out for things on a tray or a laptop, etc. A second couch goes perpendictular. with the same low wide rounded arms for your daughter-in-law. Low backs and the back cushions are useless so just store them. Two should be able to snauggle without those cushions if you get couches with deep seats. It's optional with some manufacturers. I'd choose seat cushions with pocketed coil springs and latex foam. Just like the quality you'd choose for a mattress.

Who makes these? Lexington Furniture Co. represents a long list of US manufacturers at a discount because they get furniture direct shipped. Or build your own. I'd using that setup right now.

They can consider buying a couch with a chaise instead of an L-shaped one. That would leave room for comfy chairs. It also gives you more actual seating because the corner is useless when you have guests. I just made this switch in my house.

The wall where the door is might be best for the tv. Then the seating area is available for more people to sit, and the viewing is not too far away.

I would leave the TV on the wall it is now, to be seen from the kitchen and bar.