You can see for yourself this case where the mother in law has to pay up (by selling her own home) her son's former spouse our of a property settlement post-divorce. It may defy comprehension why a Family Court ordered this against the mother in law who wasn't obviously a party to the failed marriage. Yet this could have been avoided if the son (the husband) and his wife had entered into a post nuptial agreement (the technical work is Binding Financial Agreement) protecting the son's mother's assets.
With the Family Courts discovering 'rights' which most people couldn't conceive they existed, it is absolutely critical, and the responsible thing to do, to get yourself a good lawyer, particularly when all is going well within the marriage or de facto relationship, and enter into an agreement providing for all contingencies and ensuring the parties' rights are well understood and protected.
When things go wrong in a relationship, this can't be done and lawyers are employed to clean up the mess not to prevent it. I encourage you all to get a lawyer well before that happens.
This is the piece from The Australian on 2 May 2016