I know it's so tough but maybe you can make a few adjustments.
Kids need to learn to do their homework without you sitting by their side. It's actually good for them to develop some independence. Give them some of those sticky post-it arrows and have them mark any questions they have, moving on to the next few problems or sentences and then spending 10 minutes with you at the end to go over the areas they are questioning.
Cook SMART on the weekend and involve the kids. There are lots of recipes to double up your productivity. For example, roast a chicken and turn some of that meat into chicken salad or dice it up for tacos or soup later in the week. When you make a salad, chop extra green peppers and onions for a taco bar (like a salad bar). Make a bunch of spaghetti sauce and ground hamburger but make some of it for chili. Bake a few potatoes, serve some "as is" and turn the rest into baked restuffed potatoes with vegetables in there. And so on. Make a week's worth of sandwiches, assembly-line style, for the schoolkids and freeze them. Each morning, just pop 2 out and they will thaw in time for lunch, even with an ice pack in the lunchbox. Defrost some pureed butternut squash and add it to mac & cheese for extra nutrition (kids won't know it's there). Give some to the little one instead of baby food. You'll save money, and Sunday afternoon will be a family day in the kitchen - lots of fun and a good time to talk & catch up.
Linens - I just saw a thing on facebook with a beautifully organized linen closet. When the sheets are washed, put the folded sheets and one pillowcase inside the other pillowcase. They stack so nicely and it's really easy to find all the components.
Kids can sort and match socks (good for color matching as well as fine motor skills) and put away their own laundry. They can sort their own laundry into lights & darks, and they can load the washer. They can also sit in front of the TV with the Sunday paper or the Thursday circulars and cut out coupons.
Set up a standard grocery list on the computer with little boxes to check off what you need. Organize it by aisle in the supermarket. Just check off what you need, or and/or put what you always need in a different color or with the box already checked off. Get a coupon sorter at the stationery store - I got one that's a little oversized and which has a couple of pockets in the front so I can put the coupons I expect to use in the first pocket, and the ones I'm definitely able to redeem in the 2nd pocket (meaning the store had the item, I thought the price was good, etc.). Keep that coupon file in your car with your reusable bags. Reusable bags, aside from their environmental benefit, hold more things and don't rip (thereby making for fewer trips in from the garage) and reduce the plastic bags that you then have to recycle or dispose of.
Don't use pre-packaged foods, where are not only processed, they are more expensive. On family cooking day, the kids can make their own snack bags for their lunches, such as 1/4 cup of goldfish or 6 triscuits, 12 grapes, 4 carrot sticks, whatever, but all from the larger packages. Put all those in a basket on the counter or in a drawer or fridge section set aside for them. Then in the morning, the kids pick 2 bags for their lunches - 1 fruit/veg and 1 cookie/cracker, whatever you allow. Suddenly they are packing their own lunches (with the pre-made sandwiches) and there's no argument that you didn't pack what they like!
Then, cut everybody some slack. Maybe the beds don't need to be made every day, and only the public areas of the house need to be "picked up" every so often. DO enjoy your children, but that can mean no video games in the car so you can chat, reducing screen time so everyone's at the dinner table together, and having everyone contribute to the FUN rather than the stress.
Have the kids collect toys they don't need, and hold a yard sale for the $ or give them away for the tax deduction and the lesson for your kids. Make it a family project. Find cheap or free things to do - nature areas, walks, renting a movie instead of going to the theater.
Cut back to simple pleasures, and you WILL enjoy your family life more!