https://www.siliconvalley.com/2023/06/26/travel-troubleshooter-my-brother-died-can-i-get-a-refund-for-my-airline-tickets/

DEAR TRAVEL TROUBLESHOOTER: I had tickets on United Airlines to fly from San Jose to Anchorage, Alaska, last summer. In August, my brother died unexpectedly, so we canceled our travel plans.

I reserved my airline flights through Booking.com and followed all their instructions regarding a refund. I sent my brother’s death certificate and obituary. Booking.com asked for more proof that we were related, and finally, they asked for his birth certificate. They kept asking for more documentation. Then, they denied our claim.