The courts will take into consideration whether he promised to give you a share of the house so that you didn't buy your own place, but it's very woolly.
If you're going to give up your career, have a cohabitation agreement drawn up to safeguard your future so he will pay something for you as well as the children if you break up.
Hopefully a sliding scale of rights will be implemented. If you live with someone for two weeks, why should you have any rights? But if you've been together for years, it's an entirely different story.
The woman gets the ring - unless it's an heirloom.
This is a dangerous position to be in. A court would look at your involvement in the property ... whether you have paid bills or contributed to the mortgage. It then looks at what percentage you should get.
