Then I would be wasting time and money going to court?

I read the lease agreement and it says in a clause that, Tenant shall not rent or lease without the landlords permission.

The household previous to me has always just rented to the next person without the landlords dealing with finding another person. If I have to go and look for a new tenant, doesn't that make me a principle tenant? Even w/o written approval of the Landlord confriming me being a principle tenant with responsibility of filling the vacant room?

The person I want out, sends his check to the LL. Basically, a person on lease(me) paying rent to LL and a person not on lease(him) paying rent to LL.

This is complicated!

He also has a pet in the house.
The clause in the lease says that there are no pets allowed and that no pets shall be housed w/o written approval and deposit to the LL.

If this guy is not on the lease, does that still apply to him and his pet?
Or does it not affect him cause he's not on the lease BUT still renting and sending checks to the LL?

I got to get this guy outa here!
Its riduculous!
I have lived through two different households in this house and it has always been a mellow working class type of household.
Now its like living in a college dorm!
I'm 36, I work two jobs, and this guy is taking over the house as if he has lived here longer than me!

Hes arrogant disrespectful and rude, not to mention he lacks common courtesy!

I can't even afford a lawyer!