Is Ned Flanders Flemish?

I had no idea. That’s a funny coincidence.

Back to the OP, the Simpsons wiki has an “extended” Flanders family tree.

While the Lord Thistlewick of Flanders would suggest Ned’s g-grandfather is from Flanders, at the Flanders family reunion BBQ, the current Lord Thistlewick Flanders is shown and appears to be British. A lot of nobility claimed titles for remote lands they had no real connection to. Some could be bought. The title for King/Queen of Jerusalem got passed around for centuries. The “Thistlewick” is more likely to indicate a geographic base in England.

(Also the family tree leaves out Edna and his Vegas Wife.)

That’s interesting I didn’t know that.

Here’s a good article on it including a map.

that’s because it’s in the Danish section of town.

would explain a lot