The house would likely have to be sold as a joint asset and any profit from it divided equally. Or maybe they'd both take a bath on it if they were in negative equity. Don't think California house prices are on the up recently due to the rich leaving the state in droves.But whilst living in the UK they did not own anything - no property, no cars, borrowed jewellry. The kids would get maintenace but her's wouldn't be clear-cut and certainly wouldn't involve living in a $16mil property when so little of it was actually paid for.