Here's a nice example of a monochromatic palette, fireplace and television on a nice console. In your space I think there is room for yet another chair and tables. Rather than a glass topped coffee table, a large upholstered round ottoman/coffee table would be a good choice with this set up and youngsters. Look at sofas with removable/washable slip covers for comfy use with family. Some color in pillows, art and lampshades would also be considered. Here's a look at a slip covered sofa from the Houzz shop: https://www.houzz.com/products/sunset-trading-horizon-slipcovered-sofa-linen-prvw-vr~32091784

THANKS FOR THE PHOTOS, I WOULD NOT RECOMMEND A BIG AREA RUG IN THE CENTER BECAUSE IT WILL UNBALANCE THE DINING CHAIRS EVERY TIME YOU USE. YOU CAN ADD A RUG UNDER THE CHAIRS IF YOU HAVE ENOUGH SPACE A FOOT REST WOULD BE NICE IN FRONT OF IT. SOME INSPIRATIONAL PHOTOS MIGHT HELP

I suggest take the island back to the original size and make the opening to the dining room smaller. If the opening is half as big, you'll have room for the TV to go on the new wall you create from the large opening. Then a 3-seat sofa and four swivel chairs can be squared up in a "U" out in the middle of the great room space. I would also eliminate the French doors onto the screened porch. You have so little wall space for anything but a table, and a rug won't work if that door swings into the room. Rug will need to be 36-42" larger than the top of your table and not run into walls, furniture on the walls or doors. Move the French doors to the bedroom at the north of the screened porch. You may need smaller scale than shown here, especially the coffee table.

Open concept sounds like a great idea. “Sounds” is the operative word. Sounds bounce all around in a large, single living space. Think carefully about how you and your family will actually live in one room. Can you run the dishwasher after dinner and still hear the tv? If you have kids, do you really want your living room on display to anyone who appears at the front door with all the toys all over? Can you run the food processor , the microwave, the exhaust fan while someone in the living space is trying to talk on the phone? Will it bother you to see all the dirty dishes piled on the counter while you relax at the dinner table? Where do you hang pictures if you have few walls?