Do children rarely lie about being abused?

When children lie about abuse, they are usually asking for attention. Also if the lie is against a step parent, the child is usually trying to break up the parents relationship;Trying to get their own parent to choose them over the new step-parent. Or the child is thinking, if they break up the current step parent relationship, their own parent will get back with their own mom/dad. Try to communicate with the child, build a trusting relationship, so that they won't try to break up the current relationship.