We hardly ever have prepackaged kids food (as in the meat and spaghetti example) and I say we probably have 50% convenience food during the week if I'm honest. Very very rarely we might if we were going out and not eating together.
Fishfingers are popular (although we tend to have them with mash and peas as ds isn't actually that big a fan of chips, even home made ones), as are casserole mixes (whether packet or jars - although I prefer the dry packet ones as I get to add my own veg). Pasta with a tin of condensed mushrooms as a cheap sauce is popular.
The other half of the week I'll cook from "scratch" although still make use of stock cubes etc, so not perfect. Vegetable lasagne is a house speciality that we'll all wolf down.
We all tend to eat together (or I do then reheat dh's if it's reheatable or he makes the same fresh when he gets in) so we couldn't have too much "children's food" anyway as we'd have fresh food cravings by the end of the week!
The summer is better because I tend to buy tons of salad stuff (including packaged quiche, so it probably isn't that good) and we live off that for the week.
The only coke in the house is strictly for adults, and ds never ever gets sugary penny sweets (although we're reasonably generous with chocolate buttons and smarties). Bizarrely, ds really dislikes icecream, but is a fromage frais/yoghurt junkie (we get the nice yeo valley organic ones although I will admit to buying tweenies ones if they're out of stock).
The mealtime I have the most trouble with is lunchtime, to be honest. That's usually the most rushed meal to cook (usually have 15 mins tops to prepare) and I'm always looking out for good meal ideas that we'll all eat. Toasted cheese & tomato sandwiches is popular, as is cheese, crackers, crisps (unsalted before I get yelled at, lol) and sliced pear. Unfortunately, reliance on the more processed beans & pork sausages, ravioli, beans on toast, macaroni cheese etc is also prevalent at this meal for the convenience.
I do try and at least alternate each day so that it's not always a meal out of a tin. If there's anything I'd really like to focus on to improve our diet, it would be that mealtime.