Im not an expert here by no means but experience has shown that bringing in the kids too early can have devastating effects.
Only when things are terminal 100% do you bring them so everyone can start adjuting. Involving them in squabbles or as backup to go against WS is a really bad idea.
I know all this from all angles. The life as you knew it is over. You dont take sides if you are young. You just want mummy and daddy back again.
A married couple are together through a different love of their children. You can fall out of love with a S but for a child mummy will always be mummy, etc. Unless of course there are othher issues.
To put it short... anger, vengeance, spite and children dont mix.
As for 123's jabs at wife, he is not DB at all and jabs, snide remarks, etc they wont get him anywhere. He has mentioned he has been hard on S. That is what he is achieving.
It is a tough situation by all means that we have not been taught to handle so best to listen to what the people here who know have to say.