S. Oregon Landlord-Tenant Question

[Jo Jones]

Hello,

Tenants for 2.5 yrs and I recently sent the Tenants our agreement to sign but they never returned it. I've had to give several notices to fix or move and they didnt do either. I also just found out my Tenant lied on his application and was supposed to register as a sex offender YEARS AGO!!. When I looked at his record before signing it was clean. There are 4 kids living next door and he lives with a child. 

In Oregon its very hard to evict. This is my question if anyone knows;

I now have a family member wanting the place and I gave them the required 90 day notice to move. Tenants claim they are not moving.
I will now have to evict. I do not have a signed agreement with them because they never returned it...Does it fall back on the prior written agreement? I had made changes and updated the most recent agreement, rent increase. TIA