Hi. question re: cheap (affordable) emergency airline ticket to the UK?

i’m taking a wild chance with this here, because it’s frankly my last resort. I’m not sure where or who else to ask. my brother and I need to take an emergency trip to the uk to see our very sick uncle. it’s amazing how expensive ticket prices have become these days. i’ve never flown internationally before, but according to the few people i’ve talked, the price i’m being quoted is exorbitant. does anyone have any suggestions?? any at all??! i’d be truly truly grateful. i’m trying to keep it together, but it’s difficult when i feel so helpless. any suggestions will be truly appreciated.

thanks