Previously, we had to deal with the son smoking pot in the common area, but that seems to have stopped upon our request.  

They went to clean the place after eviction and found he was growing pot in there.

You'd be wondering, well then who is going to end up using it, and will they be traipsing through my yard or peeking into my windows, and will my child be safe...or do they grow pot in there...Really, just make it easy on yourself and include it in the rent. 

Once the first, last, and security is paid and the tenant voluntarily offers more money, there is no issue.

So, getting him to voluntarily sign a mutual lease termination letter that you all three sign, would be best.Eviction would be a last resort, because she'd have to be named on it, and any eviction action that gets filed, would put her name on an eviction report database, and that would be awful for any future renting for her.If he won't sign with her still living there, the only other thing I can think of is to have her move out and break the lease. 

You learn if they show up on time, if they bring someone who speaks for them instead of being able to speak for themselves, if they show up with an entourage that reeks of pot, you can walk them out to their vehicle to see if it's full of trash and filthy, if they smell of smoke, if they are a couple and argue about everything loudly, if they have screaming, unruly children, if they don't ask about normal things like where is the laundry, what's the parking situation, how big are the closets...all things that point to someone desperate.  

.- showing up to an appointment smelling of tobacco or pot smoke (I didn't allow any smoke in my building, so if they smelled of it, I didn't believe any protestations regarding them not smoking)- not giving me requested documents when they said they would, regardless of whether or not that was one hour late or two days late.- not filling out an application completely. 

I could care less if the tenants had a garden , as long as its out side and its not pot plants .

The furnished units would come with the following  a sectional couch, beds, pictures on the wall, shower curtain, rugs, dishes , pots and pans, dining room set.. etc.. 

The relevant section of the lease in question states:If Tenant elects to voluntarily terminate this Lease during the initial Term (for example, house purchase, voluntary job change, marriage), two (2) full months' written notice prior to the rent due date to quit and vacate -- to run from the first of the month to the last day of the second month -- shall be given to Landlord.