The phrase "to whom this belongs" is correct and usable in written English. You can use this phrase to ask who is the rightful owner of something. For example, "I found this necklace, to whom this belongs?".
I first saw the man to whom this laugh belonged in an elevator.
Invited by Mr. Hamilton, Mr. Feinstein was all sincerity as his skateless self but dwarfed by an arena for those to whom this show belonged.
The diadem was eventually bought by Van Cleef & Arpels, to whom this unique relic still belongs.
Ever since the onset of this current century, those on the side of Ferguson and Zakaria, mostly in the West, have been obsessed with the question to whom this new century shall belong.
Let us give this capital back to the people to whom it belongs.
"You are the ones to whom legitimacy belongs".
Delighted to hand over Maggi Noodles to consumers to whom it belongs," Nestle India tweeted.
Thanks to Ludwig my first paper got accepted! The editor wrote me that my manuscript was well-written
Listya Utami K.
PhD Student in Biology, Bandung Institute of Technology, Indonesia