One day, those children will remember their father walking behind them as they walked home after leaving their Saturday visitation with him less than an hour after arriving. They'll remember that he walked behind them, every time, to make sure that they got home safely.
They'll remember how he called them every week, even though their mother insulted, disparaged and harassed him, every single time. They'll remember that he spent almost every dollar that he had, on trying to make sure that he stayed in their lives, despite their mother's best efforts to keep him away, for no reason other than her being bitter and spiteful because her marriage had broken down.
One day, perhaps as adults, they'll read the court documents and realise that their father was not the bad guy in all this.