Eviction / Squatters in Oregon

[Jim Butterfield]

My neighbour up the street wants to sell her house. In a nut shell

she moved out, left her husband and son to live in it  - He passed, son still lives there. The house is trashed, he is locked out of the home, but living in a camper on the property. I called the cops, they know of the home from recent history. Officer said he has tennancy living there for over a year now. So an eviction is needed. Meanwhile the son invited a friend to live with him in the camper. The son is now in jail. only the friends are living there. Local sheriff said its not a criminal matter, they cant do anything without judges orders.

She still wants them off property. Any good ideas on how to remove them?