I just listened to this rather heart-warming conversation between Sir Paul Nurse and Prof Tori King. Paul Nurse comes from a working class family, like many of us, and in his 30s discovered his 'sister' was actually his mother. She had died by the time he made his discovery.
Ironically he is a Nobel Prize winning geneticist, but not a specialist in unravelling family history. Nurse was born in 1949 and makes the point that perhaps his generation may the the last to find stigma in illegitimacy. Tori King says that short forms of birth certificate may have been used to disguise illegitimacy and placing teenagers in domestic service in the 1920s and before was often a way of detaching them from the family. Nurse is grateful to his mother and grandparents for their care and this conversation is sensitive and understanding.