Rose Elizabeth Paget was born in 1860. She was a daughter of Sir George Edward Paget, Regius Professor of Physic at the University of Cambridge between 1872 and 1892, and Clara Paget (née Fardell) a clergyman's daughter from the Isle of Ely. Rose Paget met J.J. Thomson as a student at the Cavendish Laboratory, Cambridge and they were married in 1890. They had two children, George Paget Thomson and Joan Paget Thomson. Lady Thomson died in 1951.