First marriage and children
Jerome was married for the first time on 15 April 1874, aged 20, at the British Embassy in Paris, to Lord Randolph Churchill, the third son of John Spencer-Churchill, 7th Duke of Marlborough, and Lady Frances Vane. The couple had met at a sailing regatta on the Isle of Wight in August 1873, having been introduced by the Prince of Wales, the future King Edward VII.
Although they became engaged within three days of this initial meeting, the marriage was delayed for months while their parents argued over settlements. By this marriage, she was properly known as 'Lady Randolph Churchill' and would have been addressed in conversation as Lady Randolph.
The Churchills had two sons: Winston (1874–1965), and John (1880–1947). Winston, the future prime minister, was born less than eight months after the marriage. Amongst his biographers, there are varied opinions on whether he was conceived before the marriage (notably William Manchester), or born two months prematurely after Lady Randolph "had a fall". When asked about the circumstances of his birth, Winston Churchill replied: "Although present on the occasion, I have no clear recollection of the events leading up to it". Rumours also circulated about the parentage of Winston's younger brother John, as Lady Randolph's sisters initially believed that the biological father of the second son, John (1880–1947), was Evelyn Boscawen, 7th Viscount Falmouth, although that was mostly discredited due to the boys' striking likeness to Randolph Churchill and to each other.
Lady Randolph is believed to have had numerous lovers during her marriage, including the Prince of Wales, Milan I of Serbia, Prince Karl Kinsky, and Herbert von Bismarck.
As was the custom of the day in her social class, Lady Randolph played a limited role in her sons' upbringing, relying largely upon nannies, especially Elizabeth Everest. Winston worshipped his mother, writing her numerous letters during his time at school and begging her to visit him, which she rarely did. He wrote about her in My Early Life: "She shone for me like the evening star. I loved her dearly – but at a distance". After he became an adult, they became good friends and strong allies, to the point where Winston regarded her almost as a political mentor, and "on even terms, more like brother and sister than mother and son".
Lady Randolph was well-respected and influential in the highest British social and political circles. She was said to be intelligent, witty, and quick to laughter. It was said that Queen Alexandra especially enjoyed her company, although Lady Randolph had been involved in an affair with her husband the king, which was well known to Alexandra. Through her family contacts and her extramarital romantic relationships, Lady Randolph greatly helped her husband's early career, as well as that of her son Winston.
Lord Randolph died in 1895, aged 45.