We are going away with my in-laws and extended family (14 of us) for a week in 3 days time. We are self-catering but everytime I have tried to raise the subject of how we are going to sort out shopping for food and catering for so many people my MIL changes the subject or says we'll sort it out later. My in-laws are not horrible people but are very disorganised which I find difficult to deal with. We are staying in 3 separate cottages so it's not like we've got one huge kitchen to cook in. I have suggested to my DH that given nobody will make a decision that we take food for us and they can sort themselves out. He won't agree to this but he won't come up with an alternative plan either. It's driving me nuts. I don't want to have to go shopping for 14 people when we get there. To make matters worse my MIL won't drive and my FIL can't drive at the moment so they won't even have a car with them so I can't pack them off to the supermarket.
My MIL is very highly strung (literally lives on her nerves!) and finds cooking for more than 2 a completely stressful situation so it is very unlikely she will cook at all. It was her suggestion we all go away for her 70th and she has paid for it all which is very kind of her. We often go away with my family en mass but we put in one massive Online shop and get it delivered the day we arrive. I've told her this but she just keeps avoiding the issue.
Any (polite) suggestions?