S.A.
Hi J..
I've never lost a husband (well, I divorced him, but that isnt the same), so I can't pretend to know how hard it is to be going through what you are.
I did lose my dad to cancer four days after I turned 16, and my sister and brother were 9 and 7, respectively. From the experiences my mom and I went through, I can share a few things:
#1. Put yourself first. I know this sounds counter-intuitive, but look at it this way: if you are always running yourself crazy trying to meet everyone's needs, then you will have nothing left with which to meet your own. Make sure you are getting enough sleep, and getting some time to youself. Take at least a couple of hours a week (even if it's broken up over a period of days) to do something for you.
#2. Ask your family for more. At first, offers of help probably come flooding in. Then, after a bit of time, the offers aren't coming as often. You may need to ASK for it. Ask your family and in laws to help when they can - pick the kids up from daycare for you, watch them for you if they can. Maybe they can come over and help you clean your house, so it doesn't take as long. Maybe your mother in law or mom, or dad, or sister in law (whomever) is a really good cook. How about they make you a meal you can freeze and thaw when you need it?
#3. Don't sweat the small stuff. The world will not end if you wait until Sunday to do your laundry, or if you don't wash the dishes right after dinner. Really, it won't! Spend the time after dinner with your kids, and try cleaning up after they go to bed (except leftovers, which should be wrapped up and put away immedately). My mom used to clean the house at night after we went to bed, so she could spend the time with us while we were awake.
#4 Use whatever financial assistance you have available to you. You now only have one income. Even if you and your children collect social security benefits, it can be a headache getting them (AND NEVER EVER CHANGE YOUR BANK ACCOUNT AFTER YOU START GETTING THEM OR IT WILL TAKES MONTHS TO GET THE MONEY AFTER THE ACCOUNTS CHANGE). If it's possible, see if you can work fewer hours. If you still have vacation time, use it when you know your kids will be out of school (the older one, at least), and spend the time with them.
#5 Do not make excuses for your children. yes, you have ALL suffered a horrible loss. You and your children will never "get over" it. Ever. You will learn to live with it and move on with your lives, but not "get over" it. They are all old enough to help around the house. They can all put their own clothes in a hamper (even a two yr old), and pick up their own toys. Your four year old can dust furniture, the 10 yr old can run a vacuum. Your 2 yr old can be your little helper, too. I make cleaning a game for my son (who can dust the table the fastest? the best?). My house might not be June Cleaver clean, but whatever, we cleaned it together.
Allow yourself and your children to grieve. There is a program called Good Mourning that is for grieving children. Put them, and yourself, in a support group (any grief support group, through church, the community, whatever)... you'd be surprised how much it can help.
My deepest sympathies for the loss you and your children feel.