EstherT on Family Tree Circles

Donald Carse signed his father Daniel's death registration in 1890 Jun 23 in Dunbar, East Lothian, Scotland.
Siblings: John, Margaret Fraser, Esther (my grandmother), Alison McKenzie, George and Daniel.
Parents: Daniel and Alison Thomson.
Grandparents: John Carse and Margaret Fraser,George Thomson and Esther Wood.
I can find no b,m or d record for Donald, yet family knowledge names him as the only known sibling of Esther.