User blog:Erik Nicholaz/Something about the Van Houtens.

In "Let's Go Fly A Coot", Milhouse mentions that his parents, Kirk and Luann, are cousins.

This means that their parents (Grandma Van Houten and Nana Sophie, Mr. Mussolini and Grandpa Van Houten) are uncles/aunts to both of them.

But why is Luann's surname is Mussolini and not Van Houten as is should've been before their marriage?

I thought about that Nana Sophie is Grandma Van Houten's sister who married Mr. Mussolini and took his surname.

Later, i debunked this theory, because Grandma Van Houten isn't italian.

This means that Grandpa Van Houten and Mr. Mussolini are brothers?

Nah, they have different surnames.

Anyways, this theory is hard to analise, you can guess yourself.