How does the Canada Revenue Agency (CRA) define infirm for the purposes of this credit ?

The impairment can be physical, mental, or both. It must significantly affect the individual's ability to perform everyday activities.

The impairment must be prolonged, which the CRA generally interprets as lasting, or expected to last, at least 12 months continuously.

The person with the impairment must be dependent on you for their care. This dependency can be demonstrated through their need for assistance with basic activities of daily living or a significant amount of personal care and support.

Check for more information here at the CRA website: Canada caregiver credit - Canada.ca (opens in a new tab)