Births
COOK Lorna Josephine
Father Albert Edward William COOK Mother Alice Maud PYLE
2 Nov 1913
At Unley Ade 922/306
and I won't list Lorna Rose COOK's birth as she may be living. By her year of birth I would imagine that she may not have married until post WW2 and those marriage records are not available in South Australia.
Perhaps you need to speak with your relative again.
Cando