I found a brochure that may be generally helpful. Toward the back it had this:
Children are HARMED when parents: • Encourage children to choose between them. • Make promises they do not keep. • Criticize the other parent to the child or in the child’s range of hearing. • Use the child as a messenger or negotiator or seek information about the other parent from the child. • Withhold access to the child for any reason unless there are safety concerns. • Involve the child in the court process or share legal information. • Introduce a new partner without adequate preparation. Remember that children need time to grieve the loss of family as they knew it and may not be ready to accept a new partner.