This is the USA

Skip the aerial view, please, do a drawing to scale with every single foot and inch, of every wall, window, doorway. We're lazy, not metric.

Don't add furniture to that. : ) Take PICTURES all , and if another space can be accessed? Do the very same thing drawing and pictures, feet and inches angles of the room. Post everything in Jpeg format, do not use screen shots, and add all below in a comment box

Thank you!

For your sons desk - get a small one on wheels so he can put it where he wants - at the couch, at the dining table - wherever. Yes - move the dining table to that other room. Are you taking advantage of your verticle space? Storage can be placed in a tall unit at the walls. Screw them to the walls so they are save and will not tip over. Is your couch going to be there for a while? It has wide arm rests that take a up a lot of room. I have a couch that has narrow arm rests.

One sofa is never really cozy for 4 people, once none of them are toddlers. You need a small sofa for two people and two swivel chairs. That will feel cozier because it looks inviting to everyone to sit down.

In your rendering, try a three-person sofa, two swivel chairs as mcarroll16 says, and put a small desk where the table currently is. Coziness and warmth would come from a large rug for the sofa area, a couple pillows, and a couple warm throws. Then add art for personality. Some families have one pillow and one throw per person to make kids and adults happy. A three-person sofa makes two people comfortable, so you need the two chairs for the other two people.

The long chaise part of a sofa doesn't work very well when you have limited space to walk around it.

Yes, as suggested measurements of the room, including the windows, and so on will help a lot. As well as actual pictures of the room.