Family medical leave is unpaid, job-protected leave of up to eight weeks in a 26-week period.
Family medical leave may be taken to provide care or support to certain family members and people who consider the employee to be like a family member in respect of whom a qualified health practitioner has issued a certificate indicating that he or she has a serious medical condition with a significant risk of death occurring within a period of 26 weeks. The medical condition and risk of death must be confirmed in a certificate issued by a qualified health practitioner.
http://www.labour.gov.on.ca/english/es/pubs/guide/family.php