Is there a way to claim someone as a dependent who is not a relative or partner but whom you have been financially supporting?

[TurboTaxSusan]

You can contact the CRA to double check, but most credits that you can get from having dependants require them to be a relative.

If you are in Canada or the United States, you can call the Canada Revenue Agency (CRA) at 1-800-959-8281. If you are elsewhere you can call 613-940-8495. This page has more ways to contact the CRA: https://www.canada.ca/en/revenue-agency/corporate/contact-information/telephone-numbers.html