Interestingly more than 90% of cases of FDIA involve a person's mother. Why is not known. You could argue that mothers are more often the caregivers or that mothers are more often non-working than fathers. But I wonder how much if it involves false allegations in divorce proceedings. It is pretty common for a parent, especially a mother, to claim that a father's behavior or even presence adversely affects the child's mental health.
Sorry to say but I have seen it first hand. My ex-wife tried to claim that the kids were scared of me which was quite ridiculous. The reality is they always had a much better relationship with me than their mother and in fact moved in with me full times as quickly as they possibly could.