Gertrude Mary Hickey was my Grandmother in law. She had only one sibling: Maureen Hickey, who was a nurse in London, (Paddington area I believe.) Maureen never married and when she retired from nursing she returned to Dublin to live with her sister Gertude Mary McNamarah and family.
I have only just starred researching the Hickey / McNamara family with the help of Ealenor Mary McNamara (Mother in law).