This has been very good reading. I am also a new landlord and closed last week on a house with tenants in the home. Long story short female resident has been open to communication, and very cooperative, the male has yet to talk to me and seems to be avoiding me. The one year lease they had with last owner ended in 2016 and they have been going month to month ever since. The real estate attorney that I talked to, free over the phone that was a bit of a surprise,told me the best thing to do is serve all the tenants with a 30 day notice to quit lease, and then enter into my own lease. He said that clears the air of the old lease, and if male doesn't leave then I can start eviction, hopefully it doesn't come to that.
I also didn't want to evict everyone and start with a clear house, because surprisingly they have lived there five years and always paid on time, but it was after closing that I find out they are not getting along and she has made all the payments.