Should I evict my brother?

[Louis W.]

Currently, my brother is living in my of units of duplex rent-free in Oakland CA because he refuses to pay any rent that we initially agreed a year ago. The story behind it is complicated, I discussed that on another post if you are interested. https://www.biggerpockets.com/forums/51/topics/741921-family-property-dispute?highlight_post=4366152&page=1#p4366152

How hard it is to evict him legally in Oakland? There is no lease agreement. He just promised to pay me $1000, which he never did. He is kinda like squatter at my house now and causing trouble with neighbors.