The Nebraska court determines child custody and visitation according to the best interests of the child. The court seeks to maintain the continued involvement of both parents in the child's life. The determination of the best interests of the child includes consideration of the relationship of the child with each parent, the child's desires and wishes, to the extent that they are based on sound reasoning, the health, welfare and social behavior of the child, and credible evidence of any abuse of, or by, any family or household member.