Oh I've seen ugly divorces. If close enough you can see the reason for the anger and bitterness. Reasonable people looking out for their kids don't often do this. Highlight the word reasonable...
Did she ask for the divorce? What break down cause them to divorce?
Is he going to take a big hit financially?
Do you know him or his new partner?
Another factor could be the lawyer....they love to win....it's a game to win.