There is a case in which a woman endured spousal abuse for a long time, and finally escaped, but by the time she did, one of her children had become abusive towards her, and very likely this was because of seeing how her husband treated her.
After all she had suffered, this second betrayal was overwhelming for her.
There are several tragic, tragic lessons in this. Children are children; they don't have the wisdom, the detachment, the coping mechanisms available to adults - and so they are affected by their childhood environment, sometimes beyond our ability to repair. Abuse that we tolerate 'for their sake' may actually be intolerably damaging to them, and they may blame us for the damage, because it is much more significant to them - in terms of their own lives and how they will live them - than our loving but tragically misguided sacrifice.