I find it very strange that the op hasn’t actually detailed whatsoever what the husband was doing in those 5 hours. It’s surely entirely relevant. She’s been back several times, and could have clarified that he was indeed doing nothing and thus yes, in that case, the 8 year olds dinner was on him.
(Although I must confess, whilst I’m ordinarily a really good parent who goes way above and beyond for my dc on the daily, there are absolutely occasions when I’ve said to my dc ‘I absolutely cba cooking tonight. I’m spent. Could you bung a pizza in the oven for me and sort yourselves out’ Easily from when they’re old enough to bung a pizza in.)
so it’s entirely possible that he was working the whole time, and didn’t eat himself, in which case, it is completely reasonable parenting to delegate the cooking to the 15yo, albeit a bit late.
it is also perfectly possible that the man is a complete selfish arsehole, as I said in my first post, but given the omission of the 15 year olds age in the op, and the omission of what he was doing for the 5 hours, because then the responses will go in the ops favour as we’ve seen with most posters assuming he was doing nothing and the 15 year old was diligently doing their homework (both points at this stage assumptions) - there could well be a different side of this story.
also, I have to disagree with the general point that ‘it’s a parents job to make dinner’. I would say it’s a parents job to turn their children in to decent adults, and that will absolutely include age appropriate chores such as a 15 year old making dinner.
and before anyone comes at me to say ‘it’s not if the parent is doing nothing’ please bear in mind that whilst he might have been, the op hasn’t actually clarified what he was doing.