sorry you didn’t come away with much ... but I’m not surprised. I do think finding out about your legal rights would be the next logical step, if only as a “backup” and added security when you draw that line in the sand.
The divorce laws of most European countries are kind to the economically weaker partner (child support and alimony) of a long-term marriage, but I’m not familiar with Finland specifically. There is also a tendency to grant physical custody to the mother.
Are your children dual citizens? Do you have passports for all of them? Just curious.