Do you buy/cook food for your step kids?

So my husband and I have six kids between us. I have 3 (boys 18, 15 and 13) and he has 3, two boys and a girl (22, 11 and 8). Lately when his kids are at our house, he’s been asking what I’m cooking for dinner. I just plan and buy food for me, my kids and my husband. He was handling their food.

His 11 year old boy is autistic and will only eat like 3 different foods. I don’t do the short order cook thing, so if you don’t like what I make, tough tits! Buying food and cooking for 5 people is more than enough and a large portion of my income already goes to food.

Do you ask your spouse to pitch in for their kid’s food or do you buy food for everyone on your own? I will mention that I am responsible for buying food for our household (me, my kids and my husband). Is it wrong of me to ask him to contribute money for the extra food I need to buy when his kids are here or let him worry about what to cook for them?