Legal question about leaving a residence before the year lease is up.?

I moved into my home in California in April 07. The home was not cleaned prior to us moving in and there were several items that needed to be fixed. The ceiling has superficial damage from a broken water pipe last winter (b4 I moved in) & a week after I moved in the garbage disposal broke. The GD was finally fixed earlier this week and the ceiling is supposed to be fixed next week. I had a feeling before that the owner was coming into the home without my permission but I did not have proof until last week. My nephew (15 year old) was sleeping when the owner and 2 other people came into my home unannounced and without a legally required notice to look at the ceiling. I tried to file a police report but they will only do it while he is in the home and I have NO way of knowing if he is in the home since my nephew is no longer in th home during the day. I would like to vacate the property and can do so in a week or 2 but I am not sure what he can do to me legally. What are my options?