Hi, Have you searched 1911 1916 Census ?
Do you have names of children other than Lillian & Minnie?
Search: Alberta GenWeb Local History Book Index - there are a number of MOSSOP names .
Birth Registrations are available from the Govt of Alberta -Vital Statistics Registry offices in Edmonton - the cost aprox $40. Info may be restricted if persons still living.
Alberta Genealogical Society ahs published a book of Vital Statistics to 1905.
Provincial Archive in Edmonton - may have some information.
BRITISH COLUMBIA:
Searched Provincial Archive of British Columbia Vital Statistics -
Marriage 1859-1934 Birth 1872-1903 - Death 1872-1989
http://search.bcarchives.gov.bc.ca/sn-3D3C26F/gbsearch/Birth...0 Deaths found for Isaac or Jessie MOSSOP
Marriages for Lillian and Minnie found.
Filmed Registrations can be viewed at the Provincial Archive in BC - Some Public & University Libraries in the Province of BC - also at Latter Day Saints Family History Centres -[anywhere -film may need to be brought in for a fee]
There are Volunteers at Random Acts of Genealogical Kindness British Columbia.
Searched: Family Search Org. online -
Marriage Date: 21 Dec 1921
Marriage Place: Chilliwack, British Columbia, Canada
Groom: Frank Charlie KUPILLAS
Age: 31 Birth Date: 1890
Birthplace: Jamestown, North Dakota USA
Marital Status: Divorced
Groom's Residence:
Father's Name: Joseph Blattwau
Mother's Name: Josephine LANG
Bride : Lillian Jean MOSSOP
Age: 17 Birth Date: 1904
Birthplace: Morumfeide, Alberta Question this
Marital Status: Spinster
Bride's Residence:
Father: Isaac Graceon MOSSOP
Mother: Jessie Ann RIUTOL
Film Number: 2032869
Digital Folder Number: 4400868
Image Number: 1924
BC Archives Film Number: B12906
Registration Number: 1957
Banns or License: License
Marriage Date: 05 Apr 1928
Marriage Place: Chilliwack, British Columbia, Canada
Groom: Victor Clarence GIBSON
Age: 23 Birth Date: 1905
Birthplace: Rossland, British Columbia
Marital Status: Bachelor
Residence:
Father: James GIBSON
Mother: Mary GIBSON
Name: Minnie Evelyn Yvonne MOSSOP
Age: 22
Birth Date: 1906
Birthplace: Morningside, Alberta
Marital Status: Spinster
Bride's Residence:
Father: Isaac Clayson MOSSOP
Mother: Jessie N RINTOUL
Film Number: 2074552
Digital Folder Number: 4400880
Image Number: 646
BC Archives Film Number: B13756
Registration Number: 668
Banns or License: License
Cheers, Stella