As you are a US citizen, you are required to file a global tax return. Both of you will first prepare and file the Canadian Tax return. You will then prepare and file a US tax return with your global income. You will report your Canadian farm income and rental properties in this US return. You will then claim a foreign tax credit for the taxes paid to Canada as per the US – Canada treaty.
https://www.irs.gov/newsroom/reporting-foreign-income-and-filing-a-tax-return-when-living-abroad
