I really sympathise, as I've lost weight and gained some again. My tips are-
Eat healthily and sensibly
It does no harm to calorie count at first so that you know what energy you are taking in
Increase vegetable intake dramatically-include roast veg, frozen and tinned and salads or side salad (10 a day ). It is healthy and should become a long term aim
Healthy carbs are absolutely fine. Eg. wholemeal sourdough and porridge etc. I don't avoid them
Base meals around vegetables with a small amount of protein instead of the other way round
Include some vegetarian meals. Eg soy burgers, pulse based dinners, vegetable curry, nut based meals
Give up alcohol, or drink very little. Sadly alcohol really is a diet killer
Have the odd treat. Not every week but sometimes
Kids will mostly eat soy burgers or chicken quorn meals, veg bolognese or lasagne and stuff like that
Perhaps start to slowly reduce any unhealthy foods the kids eat, and eat meals they like minus the tons of mash, or replace eg fishmongers for your meal with frozen fish etc.
Absolutely do cook large portions of healthy food and freeze individually-not just soup, for days you can't be arsed but kids are having stuff you wouldn't choose.
I freeze jam jars of home made tomato sauce, either for pasta based dishes for the whole family if I'm having something they hate or for quick pasta dishes or sauces for me if vice versa.
Take your own packed lunches when travelling or even meeting friends
Try to include exercise in your daily life by walking places etc.
Try to avoid eating in the evening.