My initial reaction was - that's bonkers...
Then I remembered - childhood obesity epidemic, stupidly large portions in most restaurants, austerity hitting most family's pockets hard (and it was 5 of them went)...
So...depends where they went re portion sizes (also type of food) and price, what else they'd eaten/we're going to eat that day, activity that day, are the DC healthy sizes.
I'm overweight and in most restaurants now a child's meal is more than enough! Especially if having starter/dessert too.
However, healthy weight teen boys also burn a lot of cals...
Conclusion - more info needed.
I also agree children's SERVINGS in restaurants should NOT be different food than the adult menu. I loathe the ubiquitous children's menu of chicken nuggets, fish fingers, sausages with chips and peas/beans or very occasionally a basic pasta dish too not least because I had a child that hated chips! But in addition
(Restaurateurs PLEASE take note several on thread saying same)
It's BORING
It's crap nutritionally
Restaurants should be places where you can have/try things you wouldn't at home - with kids it can be a great way to get them to experiment
Most restaurants adult menus have huge choice for all but the fussiest children there will be something they'll like (and good restaurants can usually adjust for the fussier customers).
Restaurants should just offer half or full portions. I know a lot of adults would prefer to order a half portion, it would also reduce waste.
However, it sounds like there's deeper issues here. Your ex will lose his son if he carries on like this. It's not just the amount of food it's his father not accepting he's older and treating him appropriately for his age!
I had a similar problem with dd. She was being given MUCH smaller portions than she needed (and I MEAN needed she has always been very slim and usually only just into healthy weight rather than underweight) plus even the last time she was at her dads she was early teens and being given plastic bloody dinnerware! Inc cutlery alongside her half siblings (toddlers at this point). I had umpteen discussions with ex to no avail - twice she came home UNDERweight and I was livid!
This along with other but similarly veined issues have made her reluctant to visit - but she would have if he'd asked/arranged - he hasn't in several years.
Are ex and his wife healthy weights? My ex is but slim, his wife is TINY and diets if she gains at all. I suspect an ED. Not based just on appearance but comments she's made and what dd has told me about her eating habits etc.
Agree it's more concerning regarding the children there full time.