We register the legal ownership rather than the specifics around joint owners wills/trusts. As a result I imagine that the property is registered in their joint names and a restriction has been registered to protect the arrangement you refer to - you can and should
check the register online and read more about
private trusts in our Practice Guide
Our
online guidance also assists with regards what to do when a property owner dies depending on whether the property is registered/unregistered and/or what you all decide to do
We can't advise you on what you 'need' to do in such circumstances as we register the outcome of those decisions and are not privy to the trust/wills and more.
We always recommend that families seek legal/financial advice re such matters to not only discuss what had been arranged previously and is already in place re the trust/wills but also to consider what may happen next and what's then required/what options exist. You can then apply, if necessary, to update the register as appropriate