I am torn here because I always want what's best for the children. I myself was a child whose complaints went unheard and ignored.

However, the law and courts have gotten involved. I would assume then that the child has had opportunity to be examined medically and by forensic psychiatrists and psychologists. While these can't 100% make a finding either way, the professionals can at least form an opinion. And the courts respect this. And, if there is a possibility I would think they would continue to follow it.

If you feel that you have caught the mother out on previous statements you are right to see this as a raised red flag.

Do you get involved? If it were me I wouldn't seek out a time to discuss this. However, if the topic were to come up I would be honest about my concerns.