more people living in the house than on the lease

[Nancy Wang]

Hi I would like inputs on how you guys would handle this situations.

My rental in Fort Worth has 5 bed 3 bath. It was rented out to a family of four 27 months ago. The lease was originally for 24 months then extended for another 8 months to end in summer. Today is the first day I inspect the house in 27 months.

The house is in super dirty condition - trashes everywhere, toilets and sinks are so filthy, AC vents are covered by black stuff and filter is black too. There are more than a dozen full trash bags accumulated in the back yard. Never saw any place like this dirty. 

Besides that, at least 3 more adults are living there - the husband's 2 adult brother and mother. All the 5 bedrooms are lived in and the game room also has 2 beds. 

Nothing is broken in the house obviously - no leaking or sewage blocked surprisingly. But the carpet and walls are super dirty now. When they move out, I don't think the carpet is salvageable and the house needs to be repaint. 

I would like to know you guys opinions:

 - it is renter's choice of their life style so I have no place to say anything about their living conditions, even they are abusing my property?

 - 3 adults living in the property who are not on the lease. What should I do - ask them to leave, or charge extra monthly? 

They have been paying rent OK. Always late, but always communicate and pay late fees. The rent is on market price. 

Your inputs are greatly appreciated. I could just let them stay this way, but I am afraid once they move out, their 1 month rent worth of deposit will not cover the cost to get the house back to rent-able condition.