There's this birth: Harriet Donald March Q 1850 in Poplar MMN Young
1871 census: Poplar
Mathews (Mattias) Young born c1808 Kent
Dau: Sophia Young 18 born Middlesex
Granddaugher: Harriet Donald 21 born Middlesex .....possible Dau of Andrew & Harriet Donald
1861 census:Poplar
Matthias Young 51 born Pembury Kent
Mary Ann 50 born Pembury Kent
Matthias 20 born Middlesex
Elizabeth 19 born Middlesex
John 17 born Middlesex
Sophia 8 born Middlesex
1851 Matthias Young 42 and his family, Mary 41, Davy 17, Matthias 11, Elizabeth 9 and John 7 recorded in Poplar
1841 census living in Poplar Selina recorded with them;
https://www.familysearch.org/ark:/61903/1:1:MQVZ-L7K