Need help with Tennant

[Brian Corbett]

Hello Bigger Pockets community

I have a 2 year tenant who has a girlfriend living in the house (single family) who isn't on the lease. This is a breach of our agreement however the tenant isn't breaking any other lease terms otherwise. I have attempted send him a letter about this but it was returned. I think I know I need to deal with this but on the other hand I am somewhat reluctant to do so. I need some encouragement. The tenant is kind of a grouch and I just don't feel like dealing with him, especially since he pays on time and his rent is slightly over market. 

[John Underwood]

@Brian Corbett So Your tenant has rented your whole house. He pays on time and pays over market rents.

Why bother upsetting the apple cart over this?

When the lease comes up for renewal add her then.