Wivenhoe - not surprised you are having problems. The transcriptions vary wildly between Ancestry and FindMyPast.
Using FindMyPast
1871 113 Hospital Street, Govan, Glasgow ( address on Jane's marriage certificate)
Janet Drummond, head, married 49 born Cambuslang
Jane Drummond, daughter 21 born Glasgow
William Drummond, son 20 born Glasgow
John Drummond, son 18 born Glasgow
Gavin Drummond, son 16 born Glasgow
Janet Drummond, daughter 10 born Glasgow
Jane McKay, boarder 45 born Rutherglen
1861 St Andrews Sq, Calton, Glasgow
M Drumond (f) head, widow, 36 born Cambuslang
William Drumond, son 16 ( shows as 10 on Ancestry) born Lanarkshire
John Drumond , son 8 born Lanarkshire
Gavin Drumond , son 6 born Lanarkshire
Robt Drumond, son 2 born Lanarkshire
Jean S?abie, boarder 8 born Lanarkshire ( Jean Shdabie on Ancestry/ Shrabie on Speople)
Josiah Niven, boarder age 12 born Lanarkshire
Jean McKay, sister age 20 born Lanarkshire
1851 2 William Street, Calton, Glasgow
William Drummond, Head, married 38, machine maker born Glasgow
Janet Drummond, wife, 29 born Glasgow
John Drummond , son 0, born Glasgow
William Drummond, brother 28, Plumber, born Glasgow
Elezabeth McKay, servant 27 born Glasgow
Jane McKean, visitor, 25 born Glasgow
Jane Sthornlie, visitor, 2 born Glasgow (Sthomlie on Ancestry)
Isobel