Legal Question in Family Law in California

Several years ago the U.S. Supreme Court held that grandparents do not have any visitation or custody rights beyond the rights of the parent that is their child. Your question does not indicate whether there has been a death or divorce. In the event of the death of a parent, the grandparents on that side of the family can only request voluntary visitation. If there has been a divorce and a biological parent has limited custodial or visitation rights then the grandparents on that side of the family generally have to rely on that parent to have access to the child. There are other factors that may be involved, but without additional information your question can only be answered in the most concrete terms which is to say that generally no, there are no special visitation rights for grandparents.