in asian countries arent that rare especially in extended family i'm in my thirties already have several grandson(from cousins), few of my friends had them when in their 20. and few of my cousins are older than my uncles too😅
Well my oldest first cousin is just 8 years younger than my father and his kids are 2-3 years younger than me . I'm still their aunt despite our little age gap 😅.
So basically it means that ZSC is the cousin of his grandpa on his mom’s side. Also because the man he comes in with he calls great grandpa and ZSC calls him uncle which means that ZSC is one generation down from the older guy and on the same generation as the dudes grandpa 😂