Batch cook. Don't attempt to cook every day. Get the family used to eating the same meal at least two days in a row.
Try to incorporate more vegetables into your meals, and beans too, along with lean meats. Cut back on starches like white rice, pasta, and potatoes. Look into avocados, sweet potatoes, brown rice, whole wheat pasta - reduce your helpings of starches too.
Buy healthy snacks. Baby carrots, hummus, naturally low fat mozzarella string cheese, and nuts that are not roasted/salted. Get used to checking the nutrition label on items you buy. Greek yogurt, eggs, oatmeal - all good. Fruit is nice too - pineapple chunks, blueberries, apples, bananas.
Don't snack at night.
Brush your teeth after dinner.
Cut way down on alcohol, eliminate other liquid forms of sugar like squash, fizzy drinks, and sugar in your tea or coffee. Substitute flavored fizzy water if you like fruity flavours and fizz. Don't drink "diet" drinks - the intense sweetness of artificial sweetners messes with your willpower.
Cut way down on white bread, baked goodies, sweets, desserts, but allow yourself a little treat every day so you won't feel deprived.
Try to find a small place of calm and serenity between your own two ears where you take inventory of your day, give yourself a pat on the back, and look forward to tomorrow and what you'll achieve. Light a candle? Sit still and make yourself focus just on you. Keeping a little diary where you try to be positive about your days can be encouraging when you're slogging through life with young children and nobody seems to see or appreciate the huge amount of effort you're putting in just to keep things ticking over.
Maybe force yourself to take a little walk in the evening, park way out at the perimeter of the carpark when you shop so you have more distance to walk, take the stairs at work if that's an option, or buy a set of handweights to use when you're sitting down in the evening.
It's not all or nothing. You can take small steps toward a goal and still reach it. You may find you gather momentum weekly as you see improvements.
For me, the death of a relative from complications of T2 diabetes (kidney failure, and eventually sepsis) was the kick up the behind I needed to change habits that were leading me down a slippery slope. I had gained weight during lockdown and when I was finally able to get to the doctor to have a normal wellness check-up the number on the scale was gobsmacking, as was the cholesterol number from my blood tests. I spent a week feeling sorry for myself and then started to get my act together.