When I say kids, they are older teens. I work full time and commute daily.
I had 24 hrs notice of dd coming home from uni on Wednesday so we got a takeaway on Wednesday night when I got in, she was in a couple of hours before me, I'd had a really heavy day at work in preparation for a really heavy meeting Thursday. I hadn't much shopping in so the next night after work Thursday eve I went shopping locally picked up some fresh bread and rolls and stuff and some snacky stuff.
They are both at home all day and more than capable of cooking while I'm working. So I came in tonight (about 6pm) exhausted and they've asked me what I'm doing for dinner at 8pm. I had made an assumption they'd fed themselves. 
AIBU to reply that dinner is what they want to cook?