what jobs did clark and ellen have

Clark had an office job. Wife was a mother.

Clark was an executive with a nutritional agency, and I don't believe Ellen was employed

I grew up with these vacation movie but it took me years to understand Clark worked for a company that adds chemicals to food to make them last longer.

I just rewatched European Vacation and he states that he's in "food additives and condiments."

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I don't think Ellen had a job, but it pretty much says in all of them that he works in the food additive business.

ellen is mentioned to have a job in vegas vacation.

Clark developed food additives.

Clark has always been a chemical engineer. Good job, developing food additives. If you pay attention, in Christmas Vacation there is a molecular model on his desk. It takes brains to do chemistry, which is why it's weird that he's such a bumblefart.