I have a family Member on SSDI Disability, who doesn't have to file. However they got a mortgage interest form, should they file?

I have a family Member on SSDI Disability, who doesn't have to file. However they got a mortgage interest form, should they file?

Should they file taxes if they are not usually required to? their only income is SSDI disability income. And they have a small old house (value about 90k) where they get a mortgage interest statement.

Would there be any need or benefit for them to file? 

Thanks!