Under the Inheritance Provision for Family and Dependents Act, it is possible for a spouse, child, anyone who is been treated as a child or anyone who is being maintained by the deceased to make an inheritance act claim to get money from the deceased’s estate.
Under section 1 of the Act it applies in respect of spouse or civil partner, a former spouse or former civil partner, a child, anyone not a child but treated as a child or anyone being maintained wholly or partly.
Under the provisions of the therefore, grandchildren have no claim to make.
They would therefore have to bring a claim on the basis of undue influence because, from what you have said, lack of mental capacity is certainly not on the cards.
There would be no legal aid for that and they would be faced with paying their own legal costs.
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