If you're looking to lose weight quickly, drop the dairy and fruit for awhile, and keep carbs under 50g. If that doesn't work, you may need to count calories for awhile, especially since your body is still getting used to being a fat burner.
As to meals for your son, get him involved in the cooking. He'll be much more likely to try different things if he's helping with the planning/meal prep. If the kids don't like sweet potatoes, there's nothing wrong with skinless white potatoes-make french fries! Make things that have the veggies mixed in, so they're not as overpowering, or noticeable-things like stews, frittatas, soups, smoothies (you can throw leafy greens in without tasting them), curries, etc. But mainly, get them more involved in the process!