Alice M Cook Born Armidale Nsw Australia 1906

Am curious if Alice M Cook born Armidale 1906 NSW.had a brother.her father was George Arthur Cook born approx 1869 Bingara NSW, her mother I believe was Sarah Ann Giles born approx 1885 Armidale NSW.It is apparently on record that my father Phillip Knox Giles was a brother? to Alice May Cook.Later in life Sarah Ann remarried a Frederick Ernest Boyd and resided in the Cleveland Qld area.