First of all it's awesome that you walk every day :) now all you need to do is tweak what and how much you are eating and you will be away laughing.
If I could offer you one piece of advice it would be don't skip breakfast. Breakfast is the worst meal to skip. If you feel you have to skip a meal, skip dinner. However, I don't recommend skipping any meals. Have porridge for breakfast every day. It's good for you and it's yum and you don't have to work it around your kids because you can serve it up to them as well. If you were to change justbone thing in your diet, it should be this.
Please don't go "on a diet". They are just a quick fix, what will you do when you get back down to your goal weight? Will you start eating the same as you were before the diet? Make a lifestyle change instead. Your kids will thank you for it :) By the sounds of it you are already teaching them awesome things about excercise with your walking and running. Help them learn to make healthy decisions about food as well.
Sorry, I know I sound like a bit of a fanatic. I've never been overweight either so perhaps you could say I don't truly understand. It's probably not as easy as just "making a lifestyle change", but you don't have to do it all at once - just a little bit at a time. Start with breakfast
P.S. Sorry about all the spelling mistakes. Have done this all on the iPod touch. Will fix it up when I get back on the real computer.