Co-signer question/non renewal

[Michael Vargas]

I have a tenant in PA, who applied along with his father/co-signer. He is on a month to month lease and as a business decision we have decided not to renew the lease. The co-signer does not reside in the unit. 
I will be sending a certified letter of non renewal to the tenant address, post the notice on the front door and email the notice to the tenant. The PA lease states 30 days notice. They will be getting sufficient notice if I did this 10/16, to be out by the end of November.

Do I or should I send certified mail of the notice to the co-signer also? 

We did a move in walkthrough and signed the form. I also plan to give instructions on what is expected of the move out process and final walkthrough. So the tenant can return keys, provide in writing the address to send their security deposit, minus any deductions is necessary. Am I forgetting anything?