What I love most about this is that there seems to be some form of nominative determinism at play here because the surname of the original owners is Sizeland, which doesn't take a big leap of the imagination to connect to their owning an island of notable size. At the very least, Sizeland is definitely an aptonym.

https://en.wikipedia.org/wiki/Nominative_determinism

https://en.wikipedia.org/wiki/Aptronym

From the title, I was expecting https://en.wikipedia.org/wiki/Stand_on_Zanzibar (title from a mention in the novel of a factoid that the entire human race, standing close together, would just cover Zanzibar.

Would love to see either this or Brunner’s https://en.wikipedia.org/wiki/The_Shockwave_Rider as well-produced films.

Do they have electricity and running water?

Looks like a lot of running water to me.

https://en.wikipedia.org/wiki/Mother-in-Law_Island AKA "Not enough room" island

The "Sizeland family". What a perfectly matched name.

I see there is also something similar here , castle in an island https://www.boldtcastle.com/visitorinfo/

They're around 250 metres from each other.

The Thousand Islands seems a completely ludicrous place that feels like a fantasy novel. Or Legend of Zelda: Wind Waker

https://www.google.com/maps/dir/Boldt+Castle+%26+Boldt+Yacht...

Cool looking house.

I'd have to wonder how they keep the siding in shape, though. You'd have to think waves would keep it wet, leading to rot or at least mold on the north side.

Anyone got any ideas about that?