You can always go to court and try to modify the custody provisions, including requesting joint custody. However, the kids will be the real losers in any dispute between you and their mother. See if you can tone down the bickering and work things out for their sake.
The response given is not intended to create, nor does it create an ongoing duty to respond to questions. The response does not form an attorney-client relationship, nor is it intended to be anything other than the educated opinion of the author. It should not be relied upon as legal advice. The response given is based upon the limited facts provided by the person asking the question. To the extent additional or different facts exist, the response might possibly change. Attorney is licensed to practice law only in the State of California. Responses are based solely on California law unless stated otherwise.