Question: Who was a British suffragist and an early advocate of birth control in the United Kingdom, who died leaving  their son to be raised by his paternal grandparents ?

Context paragraphs:
William J. Robinson: William Josephus Robinson (December 8, 1867 – January 6, 1936) was an American physician, sexologist and birth control advocate.  He was Chief of the department of Genito-Urinary Diseases at Bronx Hospital Dispensary, and editor of the "American Journal of Urology and Sexology".  Robinson was active in the birth control movement in the United States.  He was "the first American physician to demand that contraceptive knowledge be taught to medical students and [...] probably the most influential and popular of the American physicians writing on birth control in the first three decades of the twentieth century".

Frida Laski: Frida Kerry Laski (6 August 1884 – 31 July 1977) was a British suffragist, birth control advocate, and eugenicist.

DJ Ötzi: DJ Ötzi was born as Gerhard Friedle in St. Johann, Tirol, and is the son of DJ Anton Friedle.  Shortly after birth, his mother, age 17-years at the time, gave him up for adoption.  He was raised by foster parents and later by his paternal grandparents in the nearby village of Erpfendorf in Tirol.  At a young age he suffered from epilepsy, at age 16, his avulsion from home, landed him for a short time homelessness living on the streets.  His career arose gradually, first working as a student cook, then on being discovered at a karaoke competition, went on to work as an entertainer (animateur), disc jockey and singer in discothèques around Austria, as well as tourist destinations Majorca and Turkey.  Since childhood, he has endured several setbacks in his life, which continued in recent years with doctors diagnosing testicular cancer, that he defeated, only to be confronted in 2002, before the birth of his daughter, with a severe form of conductive hearing loss.

Mother Country: Mother Country (2002) is a novel by Libby Purves about a young American computer expert who goes in search of the relatives of his biological father, a teenage heroin addict in 1970s London when she had him who was pronounced an unfit mother and who died soon after giving birth to him.  Raised by his paternal grandparents, the young man has never been to England again after being carried off to America by his father, who also died young.

Birth Control International Information Centre: The Birth Control International Information Centre (BCIIC) (1929–38) was a London-based independent, international clearinghouse for birth control information established by American birth control leader Margaret Sanger and British suffragist Edith How-Martyn.  It supported the establishment of clinics and maternity advice centers abroad, sponsored lecture tours and a conference.

Dorothy Hamilton Brush: Dorothy Hamilton Brush (1894–1968) was a birth control advocate, women's rights advocate, and author.  She worked with Margaret Sanger and the birth control movement and co-wrote (using her maiden name Dorothy Adams Hamilton) with Walter S. Hayward, "The American People: A Popular History of the United States, 1865-1941" (1943) and "Your Land and My Land: The American People from Lincoln to Roosevelt" (1943).  Brush also wrote travel articles for the magazine World Traveller and a few children's plays for the Samuel French Company, which were published in the late 1920s.

Fernando Rodríguez de Castro (died 1304): Fernando Rodríguez de Castro (died 1304), was a Galician noble and a member of the House of Castro.  He was the son of Esteban Fernández de Castro, Lord of Lemos and Sarria, and Alzonza Rodríguez de León.  His paternal grandparents were Fernando Gutiérrez de Castro and Emilia Iniguez de Mendoza.  His maternal grandparents were Rodrigo Alfonso de León, son of Alfonso IX of León, and Ines Rodríguez Cabrera.

Katharine Russell, Viscountess Amberley: Katharine Louisa Russell, Viscountess Amberley (née Stanley; 3 April 1842 – 28 June 1874), often referred to as Kate, was a British suffragist and an early advocate of birth control in the United Kingdom.  She was the mother of the philosopher Bertrand Russell.

Birth control movement in the United States: The birth control movement in the United States was a social reform campaign from 1914 to around 1945 that aimed to increase the availability of contraception in the U.S. through education and legalization.  The movement began in 1914 when a group of political radicals in New York City, led by Emma Goldman, Mary Dennett, and Margaret Sanger, became concerned about the hardships that childbirth and self-induced abortions brought to low-income women.  Sanger, in particular, simultaneously sought to connect birth control to the organized eugenics movement, regularly appealing to the authority of eugenic scientists Karl Pearson, Charles Davenport, and others in her "Birth Control Review" from the early 1920s Such figures sought to prevent population segments they deemed genetically 'undesirable' from reproducing.  While seeking legitimacy for the birth control movement partly through the approval of organized eugenics, Sanger and other activists also worked on the political front.  Since contraception was considered to be obscene at the time, the activists targeted the Comstock laws, which prohibited distribution of any "obscene, lewd, and/or lascivious" materials through the mail.  Hoping to provoke a favorable legal decision, Sanger deliberately broke the law by distributing "The Woman Rebel", a newsletter containing a discussion of contraception.  In 1916, Sanger opened the first birth control clinic in the United States, but the clinic was immediately shut down by police, and Sanger was sentenced to 30 days in jail.

Frank Russell, 2nd Earl Russell: John Francis Stanley Russell, 2nd Earl Russell, known as Frank Russell (12 August 1865 – 3 March 1931), was the elder surviving son of Viscount and Viscountess Amberley, and was raised by his paternal grandparents after his unconventional parents both died young.  He was the grandson of the former prime minister John Russell, 1st Earl Russell and elder brother of the philosopher Bertrand Russell.  He was married three times, lastly to Elizabeth von Arnim, who caricatured him in her novel "Vera".  Despite his landmark achievements in other respects, this Earl Russell is most famous for being tried for bigamy in 1901, after which he was known to Edwardian society as the "Wicked Earl".

Supporting paragraphs: Frank Russell, 2nd Earl Russell Katharine Russell, Viscountess Amberley
Answer: Katharine Louisa Russell