Here they are in 1881 but I still don't know how they might be connected.
1881
RG11 Piece / Folio 3682 / 120 Page 58
Census Place Kirkdale, Lancashire, England
Dwelling 55 Rockingham St
Name Relation Marital Status Gender Age Birthplace Occupation Disability
John BLACKLEY Head M Male 59 Scotland Mariner
Ann BLACKLEY Wife M Female 41 England
Alex BLACKLEY Son U Male 17 England Labourer
William BLACKLEY Son U Male 14 Lpool, England Scholar
Ann BLACKLEY Daur U Female 11 Lpool, England Scholar
Agnes BLACKLEY Daur U Female 9 Lpool, England Scholar
John WATERSON Boarder U Male 36 Carlisle Labourer
John CHRISTIE Boarder U Male 24 Lpool, England Mariner
Possible
Marriages Jun 1855
BLACKLEY John Liverpool 8b 71
GERMAN Ann Liverpool 8b 71
MOODY Mary Jane Liverpool 8b 71
SKELTON William Liverpool 8b 71
groom's name: John Blackley
groom's birth date:
groom's birthplace:
groom's age:
bride's name: Ann German
bride's birth date:
bride's birthplace:
bride's age:
marriage date: 28 May 1855
marriage place: St. Peter, Liverpool, Lancashire, England
groom's father's name: Robert Blackley
groom's mother's name:
bride's father's name: David German
bride's mother's name:
groom's race:
groom's marital status: Single
groom's previous wife's name:
bride's race:
bride's marital status: Single
bride's previous husband's name:
indexing project (batch) number: M00706-4
system origin: England-EASy
source film number: 1656678
reference number: it 6, p 150, no 299