For property refund, I guess I need the M1 form? Where do I get it? If the person didn't work all of last year?

The M1 is the main state income tax form for Minnesota.

 

The form for the 2021 Property Tax Refund Return is M1PR. You can find the instructions for this form here.

 

The form itself can be found here.

 

Please read the instructions carefully, because it is not clear to me that you will qualify for this refund.