The phrase "to whose" is grammatically correct in written English.
It is used to refer to possession by a person or thing. For example, "The house belonged to whose parents?".
Dictionary
to whose
pronoun
Of whom, belonging to whom; .
Exact(59)
We may ask, to whose?
To whose benefit?
But to whose benefit?
But standardised to whose technology?
To whose door will the 95 fatwas be nailed?
It boils down to whose 35 or 38 are better.
Later she mentions "this hellish sun" to whose light she is exposed.
The question about 2013 is whether that stalemate can be broken and to whose advantage.
One wants to ask: To whose pain, Ma'am, do you refer?
The film's sympathies, though, lie entirely with the victims, to whose memory it is dedicated.
The plankton are eaten by tiny crustaceans to whose shells Vibrio attaches.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com