Hi Fermi, your mother's rose is almost certainly MRS RICHARD TURNBULL (Alister Clark, 1945) Emily Isobel were her given names. Her husband owned TAMBO Station about 700 km from Brisbane but also had town mansions in Sydney (REDLEAF, Double Bay) and Melbourne (demolished, Toorak). They were well known race-horse owners and breeders. He was Chairman of Victorian Racing Club for a very long term and also chairman of Flemington racing Club. She died in 1948. Her two sons both killed in WW 2. Her daughter married in England. The rose is Rosa gigantea x unknown.