But then there was this entry, in the list of my father's siblings:
Betty Jean .... born 27 June 1930 Carlton, Melbourne. Betty Jean was born with cerebral palsy due to her mother suffering a haemorrhage caused from having teeth extracted during the pregnancy. As a consequence she was placed in a children's home in Melbourne and is believed to have passed away there circa 1947. (Source: Interview with (older sibling)).
I think that's about the saddest thing.