Greetings and welcome to BYC! Very nice basic coop. Your hubby and F-in-law did well. There are a couple of concerns you might want to look into however.
As has been mentioned, the ventilation is completely and totally inadequate. The window by itself is virtually useless for ventilation as it's too small. The window will not be opened at night when they are roosting, and will most likely be closed during bad/winter weather, when they would also be inside. No idea your climate, but in winter, if freezing temps, their breath and poop will add so much moisture inside that you'll have frostbite and frozen combs/wattles/toes. In summer, if hot, they could easily die from heat inside there. Ideally, you want low opening to let fresh air in and high openings to vent out moisture and odors. In addition, you do NOT want the draft this will create to hit the birds when they are on the roost in cold weather. Their down jackets don't work so well if wind is constantly ruffling their feathers.
Second, I see you've used chicken wire as the security around the run. That is fine for keeping the chickens in but will not stop a raccoon, fox, coyote, dog, weasel, mink, etc. from getting in and making a meal of your birds. You may want to back up the lower 3 feet with small hole welded wire fencing, or best case, with 3' 1/2" hardware cloth all the way around. You also have to be concerned about diggers who can dig under the sides to get in.