I'm Doug, and I'm very sorry to hear of your girlfriend's situation. My goal is to provide you with excellent service today. I have been a CA licensed attorney for more than 3 decades.
You will be pleased to hear that California is a very grandparent rights friendly state.
California law confers discretion on the court to grant "reasonable visitation" rights "to any other person ---including a grandparent---having an interest in the welfare of the child.
However, the CA law also holds that parents have a "fundamental right" to make decisions concerning the care, custody and control of their children.
State law allows the judge to grant visitation to a grandparent, even over a parent's objection whenever the court determines such visitation may serve the child's best interest. This discretion to grant visitation generally applies when the grandparent has hada lot of contact with the grandchild through the child's life up to the point of a parent withholding visitation.
Even if the parents object to a grandparent being granted visitation with the grandchildren, the court can never-the-less grant visitation.
You may reply back to me using the Reply link and I will be happy to continue to assist you until I am able to address your concerns, to your satisfaction.
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I wish you and yours the best in 2016,