As per CRA, Living common-law means that you are living in a conjugal relationship with a person who is not your married spouse and at least one of the following conditions applies:

• This person has been living with you in a conjugal relationship for at least 12 continuous months
• This person is the parent of your child by birth or adoption
• This person has custody and control of your child (or had custody and control immediately before the child turned 19 years of age) and your child is wholly dependent on this person for support
   

You should confirm with CRA about your marital status to make sure you are putting the right one.

Contact the Canada Revenue Agency (CRA)
 

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