Thank you Ma'am
That actually helps you...that is, if the couple were married, it would not be possible under CA law for you, as the grandparent, to seek visitation with the child
The court can grant visitation to the grandparents IF the parents are divorced or not married AND the grandparents can demonstrate that visitation is in the best interest of the child
The California Family Code 3103-3104 permits grandparents to litigate visitation rights if a child’s parents divorce, even on the objections of both parents. It also permits the litigation
of collateral issues arising from the existence of grandparents’ visitation rights, including using such rights as a “factor” to order a change of residence of the child (3103(f)) or providing for the resolution of additional child support issues relating to the grandparents’ visits (3103(g)).
The court must find that there is a preexisting relationship between the grandparents and the grandchild such that visitation is in the child's best interest, and the court must balance the interest of the child in having visitation with the parents' right to exercise their parental authority. Family Code, Section 3100 et seq.
Factors considered by the court are: (1) child's preference (if child is old enough); (2) desire and ability of each parent to allow relationship with other parent, and (3) child's health, safety and welfare. Family Code § 3020-3424.
Thus, as a grandparent, especially in the situation you describe, you can file a petition for custody/visitation and it would likely be granted by the courts based on what you describe.
You will need to have a local attorney prepare/present this case for you to the court.
Let me know if you have more questions....happy to assist if I can