Why on earth is the express trust at odds with what you describe as an informal trust? Oh dear, this really is amazingly complicated - another good example of the God-awful messes people get into without proper legal advice, just perfect for a law exam (I only taught the subject for 10 years)...
By "property" you presumably mean real property, ie land (which just happens to have a house on it). The basic law of trusts of land is that all trusts of land or any interest in land must be manifested and proved by signed writing. This is clearly done by your express trust.
What then seems to have happened is that a sub-trust has been created: the partner is holding her equitable interest on trust for her mother (or that's the intention). We then run foul not only of the legal principle above, but of a second one which is that an equitable interest (which is what the partner has) can only be transferred in writing signed by the transferor.
There are however three exceptions to these two principles. The first is the doctrine of resulting trusts, which says that if you transfer property (of any type, including cash) to another person, without the intention of making a gift of it, you retain the beneficial interest. So any money put in by Mum could remain hers. There is the itsy-bitsy problem that your client is receiving the income and paying the mortgage, which would prima facie give HER a beneficial interest but I think we can ignore that, as she is clearly in her capacity as legal ownere dealing with both on behalf of the beneficiaries without acquiring any beneficial interest at all.
As second, similar and sometimes confused possibility is a constructive trust. This is a trust which arises in circumstances where is would be uncoscionable for the apparent owner of property to assert rights as against another person who has acted to his detriment in reliance of a promise to give him and interest in the property. Both resulting and constructive trusts are common in matrimonial property cases where the title is in the name of only one partner but the other has acquired an interest in it.
The third way in which a trust which does not comply with legal formalites can be validated is if value was given - money or money's worth. So if mum paid for an interest in the property, then the trust can be valid without formalities.
You may however have difficulty proving all this since by definition there will be no documentary evidence of the trust. You may however be able to find evidence of mum's payments and ask why she would have done this if she did not believe that she was going to get anything out of it.
Trusts law does come up quite often at Tribunals and while a lot of lawyers out there don't do it, tribunal judges have to be aware of it. So go and argue it.
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