Applicant hiding fiance's burglary conviction

[John Scagan]

I had a "single" mother apply for one of my properties. According to social media, she is engaged to a guy and, as of 3 weeks ago, the relationship is in good standing.

She never mentioned this guy to me and said she is only renting with her mother. I ran a background check on the guy and he has burglary convictions from 6-7 years ago.

I have a feeling she is trying to hide this from me. How would you approach this?