My wife recently found an older half sister she never knew existed, adopted at birth in 1949, 3 years before my wife's parents met. My wife's father had obviously had a relationship with a 19 year old girl on the next street to where he lived, he was aged 24 at the time and fresh out of the Navy. This lady has had a wonderful life, has been married 49 years herself and has children. They all live in Cornwall but moved there 52 years ago from where she and her adoptive parents lived in Manchester. She says that even though it has been 52 years since they moved she and her children, who were born in Cornwall, have always been ribbed about being outsiders.
She was absolutely delighted to see that her father was a Cornishman and comes from a long line of Cornishmen going back hundreds of years, and her credentials as a "local" are very well documented. They found one another through DNA testing and are both delighted to have found new family members. We should be meeting her and her husband next month as we will be in Cornwall for a couple of days on our way back from the Scilly Isles.