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A CHAINED GENITIVE is when the possessor already includes a genitive:
He is Mick
This is Mick's brother
Mick's brother has a pen
This is Mick's brother's pen
It is the mummy's turn to wash the dishes.
It is the mummy's friend's turn to wash the dishes.
No! But I've got to howl at the moon!
I have to walk around and then say, "Aaaaaah"
It is the mummy's friend's bat's turn to wash the dishes.
But I don't even have hands!
Not a problem.
It is the mummy's friend's bat's flea's turn to wash the dishes.
Typical!