What I meant WoWo by saying 'his loss, not theirs' is that he has lost, by his own choosing, two wonderful beautiful fantastic children.
They have 'lost' a dad, but he wasn't a brilliant dad so is it such a loss to them really? He didn't beat them up or anything (I would have left him immediately in those circumstances), but he was overly-heavyhanded with them, drunk too much and, without wishing to go into specifics, turned out not to deserve to call himself a father.
so yes - all in all, despite having affected my daughter because how could it not - he is the big time loser.