OK you live in California which in one way is bad (the economy is worse there) and in another way good.
California has been a leader in 'firsts'. They have an "Adult Protection Program". There isn't much that you can do for your dad, however, by calling the Adult Protection Division and telling them your story I would suspect they will assign a Social Worker to do a 'Wellness Check' on him and go from there. You may have to meet the SW the first time to lead her/him to where he is at. They are trained to help, housing, help with getting off the medication, putting him in a nursing home if need be, etc. They certainly are more equipped to handle this than you are.
Have you found some AlAnon meetings yet? There are tons and tons of them in the L.A. area.
My good thoughts and prayers are going out to you and your family.
Please keep posting and let us know how you are doing as we do care so much.
Love and hugs,