Legal Question in Criminal Law in California

A family member -- or any other private citizen, for that matter -- cannot "press charges." Only the District Attorney can initiate a criminal prosecution.

Once the cops and DA get involved, it is out of your hands. For instance, in domestic violence cases, prosecutors often file a case and vigorously pursue it, even if the victim doesn't want the defendant prosecuted.

Of course, every case is different, and it's impossible to give detailed advice based on your short question. If you are accused of domestic violence, you should seek advice from an attorney in your area.