Question on adding a shack up to the lease

[James Hall]

Here's a question. After reading Brandon and Heather Turner's great book on managing rental property we are working hard on setting our business up as they recommended. So, I contacted a tenant who has had a live in for about a year and told her that he needs to be added to the lease. Her response was that he doesn't really live there. He eats with them, visits, but only stays the night occasionally. I know that she's resisting because he's a convicted felon with a drug and burg history. 

So, what are my options? Can I force her to put him on the lease?