... member of my elderly mum's extended family who doesn't know he's adopted?
EVERYONE else knows - all my family, both my aunts' families. My mum's sisters live in the same country as my uncle. Years ago they made decision to keep this from him, and my mum had a falling out not long before my younger aunt died when my mum suggested that he should be told. My mum won't tell him now because she says it's not up to her. I think she's scared of falling out with her last remaining sister.
He's in his 60's now. He was adopted as a newborn when my mum and her sisters were teenagers.
I just feel so uncomfortable about the fact that his adoption is being kept from him while all of the rest of us know. It just seems so wrong. 