- Siblings
- James Postlethwaite
- John Wright Postlethwaite
- Thomas Postlethwaite
- Elizabeth Ellen Postlethwaite
- William Postlethwaite
- Partners & Children
- Herbert Wells Barber
- Esther Jane Barber
- Herbert Postlethwaite Barber
- Margaret Alice Barber
- Constance Mary Barber
- Mabel Barber
- Walter Barber
- Sarah Postlethwaite Barber
- Annie Theodora Barber
- St George Barber
- Harold James Barber
- stillborn Barber
- Robert Barber
- Philip Postlethwaite Barber
- Arthur Barber
- Beatrice Barber
- Edith Sterling Barber
- Elizabeth Wright Barber
- stillborn Barber