Provided she can prove (which you say she can) that she has a financial interest in the property, she can put a restriction against it which will prevent it being sold or remortgaged without her knowing that it is being done.
Don’t be at all surprised if the exiting partner alleges that the gift from the mother-in-law (for want of a better phrase) was a gift to them both. It’s very common.
If the daughter has children under 18, then she would be able to hang onto the house in all probability until the youngest reaches 18 but she would be responsible for the bills or the mortgage on her own meanwhile.
If he has left, he is not responsible for the mortgage or the bills of a house that he does not live in although he remains liable to the mortgage lender if the daughter stays in the property and she doesn’t pay.
Regardless of what each put in, the proceeds are split 50-50 if there is no agreement to the contrary as to what would happen when they eventually split.. There is already case law on that.
Kernott v Jones.
There are about 40 different forms of restriction and a solicitor would probably not charge more than a couple of hundred quid for doing it so unless he actually has experience of placing restrictions against properties and in view of the amount of money at stake here, it might be worthwhile visiting the high street solicitor.
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