Was your mum a member of the Beta Sigma Phi Sorority in Vancouver, British Columbia, Canada in 1953?
You might be in this snapshot. I know who two of the children are, and can guess at a few others, but would love to hear from you if you recognize yourself or another. This photograph appears to have been taken in our family's back yard in Dunbar in Vancouver.
Titled only "Sorority Party 53" in my mother's hand. Personal collection.