House Hacking obstacle Enforcing the lease

[Joshua Hughes]

Hello fellow BP family, 

I am in need of some advice on how to proceed..but first I will give a description of my house hack. 

Bought my first SFH in December of last year by using the BP analysis. I bought a 3B1B. Rented out the two other rooms & of course I am staying in the Third room. This home is about 1000sqft not that gigantic of a place. I was upfront with the space and of course have rental agreements with both tenants. Not wanting guests to get out of control I leased to (2)single younger males who said they pretty much stick to themselves. Since I have a similar vibe, I thought it would be a good fit...

To make this quick my question- One of my tenants in the other room started having a guest come over more and more often which is fine...then this person started to stay over the entire weekend. Then a night or two throughout the week. Now this person has an actual toothbrush and shower supplies moved into the bathroom. Pretty much the tenant who's renting has moved her in kind of under the radar. 

I'll preface this with two things, first my thoughts on having guests over in a smaller type house. If every room has a guest that is 6 people sharing everything, shower, toilet, kitchen, etc...Now the second is tht the guest this tenant has essentially moved in hasn't caused any problems and I really don't mind. Idk if this is because they are just trying to keep under the radar still and once i say its ok or whatever they'll get out of control. 

How do I go about approaching this? Because how I handle this "couple" will I'm sure affect the other tenant. My thoughts are that the guest isn't on the lease/application. Not paying rent or anything; pretty much living here for free. The person renting the room is really living paycheck to paycheck. He qualified 3x income but just isn't good with money, I guess. The last week of the month says that he is living on less than fifty bucks. He has 100 percent of the time paid on the 1st so he isn't horrible and seems to get that rent is important. 

What do I do about the guest? The tenants lease expires in two months..