A/Cdr George Penkivil Slade's paternal grandfather and namesake was the artist and lawyer George Penkivil SLADE (c.1832 - 1896). His maternal grandparents were Charles Gabriel BEALE JP (10 V 1843 - 1 IX 1912) and his wife (married 7 VIII 1868), Alice KENRICK (26 V 1845 - 20 III 1940), whose sister Florence KENRICK (19 VIII 1847 - 14 II 1875) was the second wife (married 8 VI 1868) of the Rt Hon Joseph CHAMBERLAIN (8 VII 1836 - 2 VII 1914), by whom she was the mother of the Rt Hon (Arthur) Neville CHAMBERLAIN (18 III 1869 - 9 XI 1940), Prime Minister, 1937-40.
Charles Gabriel Beale was Lord Mayor of Birmingham in 1897, 1898,1899 and 1905. He was a brother of Sir William Phipson BEALE, 1st and last Bt, KC (29 X 1839 - 13 IV 1922), MP (Liberal) for South Ayrshire, 1906-18.
A/Cdr Slade was also a second cousin once removed downwards of Neville Chamberlain's stepbrother, the Rt Hon Sir (Joseph) Austen CHAMBERLAIN, KG (16 X 1863 - 16 III 1937), Leader of the Conservative Party 1921-22, who was the son of the Rt Hon Joseph Chamberlain by his first wife (married 30 VII 1861), Harriet KENRICK (5 XI 1835 - 22 X 1863), who was a first cousin of Alice and Florence.
A/Cdr Slade's father-in-law, the Rev Canon William Hartley Carnegie was married secondly in 1916 to (as her second husband) Mrs Mary Crownishield CHAMBERLAIN, née ENDICOTT (16 IV 1864 - 17 V 1957), the widow of the Rt Hon Joseph Chamberlain, to whom she had been married as his third wife on 26 November 1888.
Through her Kenrick descent, Mrs Georgiana Heywood is her husband's fifth cousin, twice removed downwards:
John KENRICK (1683 - 26 I 1745)
= Sarah HAMILTON (29 IX 1695 -22 X 1775)
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John KENRICK (31 VIII 1725 - 15 VII 1803)
= Mary QUARELL (c.1718 - 10 X 1801)
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Archibald KENRICK (12 XI 1760 - 26 X 1835)
= Rebecca SMITH (1770 - 1809) (married 1 XII 1790)
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Timothy KENRICK (1807 - 23 II 1885)
= Maria PAGET (21 II 1808 - 5 V 1876) (married 10 II 1837)
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Alice KENRICK (26 V 1845 - 20 III 1940)
= Charles Gabriel BEALE (10 V 1843 - 1 IX 1912) (married 7 VIII 1868)
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Edith Mary BEALE (23 X 1870 - 10 XI 1961)
= George Penkivil SLADE (24 IX 1866 - 4 XII 1925) (married 18 VII 1898)
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A/Cdr George Penkivil SLADE (30 VI 1899 - 13 IX 1942)
= Mary Albinia Alice CARNEGIE (30 IX 1896 - 20 VI 1988) (married 1923)
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Pauline Albinia SLADE (1924 - 16 V 2009)
= David Henry Gustavus HAMILTON-RUSSELL (4 V 1911 -23 XII 1988) (married 26 IV 1950)
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Georgiana Mary HAMILTON-RUSSELL (born 31 V 1955)
John KENRICK (1683 - 26 I 1745)
= Sarah HAMILTON (29 IX 1695 -22 X 1775)
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Edward KENRICK (20 IX 1731 - 1779)
= Elizabeth HASSALL
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Sarah KENRICK (19 IV 1772 - 8 X 1855)
= Henry HAYWARD (1770 - 17 I 1839) (married 17 VI 1802)
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Henry HAYWARD (2 I 1806 - 6 IV 1878)
= (2) Elizabeth RADLEY (19 VIII 1829 - 13 V 1886) (married 15 IV 1866)
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Capt Milward Cecil HAYWARD (4 X 1870 - 23 VIII 1916)
= Constance Mary Matilda EDWARDES (1870 - 17 X 1957) (married 24 IX 1901)
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Surg-Col Edwin William HAYWARD, OBE (23 IX 1902 - 8 XII 1978)
= Monica Sybil PINE-COFFIN (6 IX 1918 - 11 IX 2013) (married 9 V 1944)
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John Kenrick HAYWARD (born 19 XII 1954)