who said the famous quote: "it isn't necessary to have relatives in Kansas City in order to be unhappy?"

Answer 1

Groucho Marx, one of the Marx brothers, who between them said many funny things.
Incidentally, there are always jokes about particular places, which are not necessarily fair, especially if you live there. For instance, the first prize in the competition gives you a week's holiday in----(fill in the place you dislike or don't think much of), the second prize gives you two weeks in----(the same place).