As far as the gun ,  2nd amendment , its a non issue  in my eyes . 2 of my tenants are hunters . 

If they change the amendments to the law, just don't ever sign it. 

check with your county or city's zoning (ie, maps, and/or call them) to ask if ADU's are allowed in ur zoning. the answer is yes or no, not maybe. if so, ADUs still need to have permits and the C of O amended to show SFH plus 1 ADU and where the ADU is etc.

If they are on month 10, and you are in an area where you can get equal or more rent, I would amend the lease to a 12 month period and let them move one. 

So what have you amended the next lease to read.

There is no language in the lease to report any issues immediately which will be amended.

PETSThe current lease does not include pets however, if desired, the lease can be amended to include 2 small pets.

I'm no lawyer, and this isn't legal or investing advice.Letter to tenants of one year on a month to month agreement: Notice of Change in Terms of Tenancy (Rent)This is an Amendment to the rental agreement dated [original agreement date] (“the Agreement”) between [your name] (“Landlord” or “I”) and [tenants' names] (“Tenants” or “you”) regarding the property located at [address] (“the Premises”).As per our month ­to ­month Agreement, your rent will not be increased until April 1, 2016. 

When the lease expires, if you want to keep her, I would amend it.

The link below goes to the PA Landlord Tenant Act of 1951.https://www.thelpa.com/PA_landlord_tenant_act.pdfI believe this is the current act, but check for amendments.