If Joseph's full name was Joseph Johnson Carwell then he died in North Vancouver on 22 Sep 1971. It also indicates he was born 7 Sep 1880 in England and was a widower. His wife's name was Sarah Elizabeth Rainbow. Here's a link to the transcription at the LDS site:
http://www.rootschat.com/links/0d9k/There is a marriage for Joseph Johnson Carwell which has Sarah Elizabeth Rainbow on the same page in Romford, Essex in the 1st quarter of 1907 (vol 4a, page 698).
I am having no luck finding Joseph and Sarah on either the 1911 Canada census or the 1916 census.
There is a passenger list for the Royal Edward which departed from Bristol and arrived in Halifax, Nova Scotia on 10 Apr 1912 which has a Joseph (32), Sarah (28) and Roy (11 months) Carwell. The passenger list indicates they were returned Canadians and were going to Edmonton. Here's a link to the image at Library and Archives Canada (about line 22):
http://data2.collectionscanada.gc.ca/e/e243/e006071309.jpgThere are a couple of possible outgoing passenger lists in 1907 that have a J and S Carwell onboard but I can't confirm if either entry is the correct one. There is also an incoming UK passenger list from the Royal Edward dated 6 Dec 1911 which has a JJ (34, contractor), Mrs (27) and Roger (1) onboard. I don't know if this is the correct family or not as I can't find a return for a Roger.
If this is the right couple, there is a researcher for the Rainbow family who has information about Joseph and Sarah. The date of marriage seems to be wrong based on the GRO index but it looks like the researcher got his information from another person and not the marriage registration. As well, the notes on the couple are repeated a number of times so you have to skip down to the bottom after reading them the first time to see information on their children. Here's a link to the entry:
http://familytreemaker.genealogy.com/users/p/a/r/Brian-P-Parsons-SK/WEBSITE-0001/UHP-0110.htmlJacquie