Virginia Clara Jane Matheson

Iam researching the Matheson family tree.

My husbands great grandparents were; Donald and Grace Ellen Matheson (nee Mcnamara)
they had 2 sons
1. James Munro Matheson born 1895 who married Victoria Clara Grace Willey.
James and Victoria had 1 child
Virginia Clara Jane Matheson Known as Virginia Clara Grace Matheson or
"Johnnie" Matheson or Jacqueline Matheson - my husbands mother who is deceased.
2. Donald Frederick born 1897

Family stories say there were 3 children and a older sister left Australia and is living in England.
Another family story is that the brother was killed in a train or tram accident in the Toowoomba Qld area.
Have searched Trove newspapers online for a newspaper article about the accident and for his death or funeral notice without success.
Have applied twice to QLD BDM for birth certificate for Jacqueline Matheson born May 1920 without success.
Have just sent off to QLD BDM for the birth certificate of Virginia Matheson born May 1920 so we will see if they can find her this time.

Anyone got some tips

Kathy Pritchard