Re the kids, David's comment is that you can't control what they eat away from home. But you can control what they eat at home. And that's mopst of their food intake.
When you settle down there are, to my mind only two criteria that matter: (1) that you feel full at the end of every meal - "Can't eat another mouthful". This indicates that your brain is getting the message from the gut hormones which are now working properly. (2) Your weight and waistline are steady. They will vary a bit from day to day, but if you measure both once a week, they should remain withing say 0.5kg and 2cm up-or-down. I find reducing my waistline harder than my weight. Walking is supposed to be very good for that.
Also, I don't worry too much if I put on 1/2 to 1 kg when I go travelling for a week or so. It's hard to avoid sugary food when eating out all the time. But if I watch carefully what I eat when I get home things generally go back to normal in a week max.
JohnN