Coeliac family is coming to stay; I’m going to remove most carbs to a different storage space, and buy new spread. Also wipe down all surfaces and oven. Is there any tips for keeping them uncontaminated in our home?

Like I know that most cereals aren’t GF, but is there anything else I should remove/clean? There’s an 8 and 6 year old that are coming, so I can’t just expect them to be careful! (Oh, and one of them is lactose intolerant!)