Is it possible to help speed up the foreclosure process on neighbor's home?

My mom and dad have horrible neighbors. They're loud, obnoxious, inconsiderate, rude, sell drugs, etc. Parents have had many sleepless nights because of these bastards. Calling the cops doesn't help much either. It had gotten so bad, that my dad considered buying their house just to get rid of them! Talk about desperation! Luckily, the real estate agent my dad was working with, advised him not to buy. She told him that the neighbors were at least 9 months behind on their mortgage payment. I guess that's good news, but we're wondering how long before they get evicted? They live in California.

Someone suggested that I call or write the mortgage lender (Citibank) and inform them on the condition of the house. It's totally trashed on the outside, and one of the teenagers who hangs out there, mentioned that the inside was just as bad. Would the bank even take this into consideration and speed up the foreclosure process?
They're definitely loud but according to one cop, there is no law against it. Even at 2:30 am! Isnt that called disturbing the peace? My dad doesnt understand how not even one of those thugs has been arrested for possession of drugs, since they're always getting high and drugged up on their porch in clear view of everyone passing by. Cops said there has been no probable cause to search them. :-(
I don't know much about real estate, so I never thought twice about the fact that the agent looked into their payment history. When I mentioned that my father thought about buying their home, he went so far as to talk to the neighbor about it. She was all for it! She gave my dad permission (not sure if it was only verbally or written) to do whatever he had to do to start the process . The neighbor never metioned being behind on payments. When you think about it, my father was actually going to do her a favor (which I tried to talk him out of) and get the house off of her hands. Geez, this is getting way too complicated! :-S