A high-level overview of how Canadian jurisdictions approach discrimination based on "family status": 

• It is included as a prohibited ground in relation to employment in each Canadian jurisdiction except New Brunswick and Newfoundland.
• Saskatchewan defines it as being in a parent-child relationship.
• Quebec uses the term "civil status".
• The Northwest Territories has a prohibition on the grounds of "family status" as well as "family affiliation".

(My source was this publication on the Canadian Human Rights Commission's website, which was last updated in early 2009).