Here is Emily's whole family.
Firstly, Hermann Ernst Sievers
1 Johann Conradt Sievers b c. 1740? Gross Mimmelage (nr Osnabrück)
+ (11/05/1764) Anna Elisabeth Adelheit Jödekens ~19-9-1734
2 Anna Catharina Adelheit Sievers ~ 21/7/1764 died 7 JUL 1839 in Rüsfort
Living descendants
2 Helena Margaretha Sievers ~8/5/66 d 22-11-1855 Badbergen
Living descendants
2 Johann Arend Conrad Sievers
2 Hermann Ernst Sievers ~9/5/1771 – 10/1829
Secondly, descendants of Hermann and Petronella
They moved to London around 1803, and then Hermann, Petronella and John William moved to Boulogne in 1825.
1 Hermann Ernst Sievers b. Badbergen nr Osnabrück 9/5/1771 d 1829 London
+ (February 20th, 1795 Amsterdam) Petronella Richier (10 March 1776 – June 5th 1849 Shoreditch)
2.1 Elizabeth Wilhelmina Sievers, Amsterdam 31 May 1795 d Rotterdam 19 Dec 1871
2.2 Ernest (aka Edward) George Frederick Sievers c1799 – 1850
+ (1830 Deptford) Arabella Wilson/Willson (sister of Eliza Willson) c.1808-1883
2.3 Peter Sievers b c1800 Hanover (British Subject) d 10th Nov 1861 aged 60
+ (1825, London) Emily Vernon Barlow Burney, born c. 1806 Liverpool died 3/11/1868
3 Emily Sarah Euphemia Sievers
Christening: 22 AUG 1826 Saint Dunstan, Stepney, London, England
Emigrated New South Wales 1846
+ (West Ham, 1845) Samuel James Theodore THICKNESS.
3 Peter Frederick McDermott Sievers 1828
Went to USA, living descendants in Kentucky
3 John Thomas Sievers 1830-1831
3 Ronella Aldina Sievers 1834-1839
3 John Nicholas Sievers 1837 emigrated to Australia 1862, ship Caribbean - never disembarked?
3 Francina Eliza Sievers 1838 (Milliner 1861) d 1869
+ ( bef 1861) Henry Thomas, Docks clerk / commercial clerk
3 Ronella Aldina Emma Sievers 1841
+ 1860 Henry George Garner b1839 St George in the East
3 Herman Ernst Beatson Sievers 1846-1895
+ 1869 Harriet Passfield b Waltham, Essex 12/12/1851
emigrated to Canada c. 1882
2.4 John William Sievers b. 1807 (or maybe 1804?) London d. 1877 Lancs
+ (1) c.1830 Georgiana Aylwin or Alboin nee Johnstone, separated c.1837
3 Ronella Georgiana Sievers 1831 Bolougne-sur-Mer d1853
3 Andrew Johnson (or Johnstone) Sievers Oct 4th, 1832
+ Sarah Budden chrs 18 Nov 1831 : Saint James, Poole, Dorset, England d. 1884 Emigrated to Australia 1850’s, several children
+(2) (q1 1838) Eliza Wilson/Willson b. 1821 Sevenoaks (Sister of Arabella Willson, Ernest’s wife) (bigamous marriage?)
2.5 Caroline Charlotte Sievers b 27 Dec 1813 Chrs 30/9/1814 St. Olave Hart Street London
+ 1864 Rotterdam Willem Pieter KOUWENHOVEN. No issue