Let’s not forget that Alice herself has repeatedly claimed that she’s never spent more than a night away from her babies. It’ll be very difficult to make this accusation now. If she does though it’s clear defamation and there will be very serious consequences for her. I’m not mentioning the girls, who will be effectively destroyed, because she doesn’t give a tit about them.They would claim it happened during the marriage and they kept it a secret from Alice because they are scared of their dad (she already laid the foundations for it by saying that they are "terrified" of him) and only now found the strength to open up or only now no longer feel like the financial pressure of destroying Ioan's career should keep them silent. She probably also would try them to remember that their dad was inappropriate by refering to fragments of their memory (that she will try to fill the gaps with). It happens quite a lot.
Obviously a case like this doesnt go far (not even for real victims). But this doesnt matter. The damage would be done.