1. I regret to say that you cannot claim expenses for attending a funeral from the estate of the deceased unless the will of the deceased grandfather speifically provides for this to occur. If the will specifically provides for the payment of third party expenses in attending the funeral, there will be treated as gifts under the will and they will be liable to Inheritance Tax.
2. Accordingly, your mother's brother cannot claim his expenses in attending the funeral from the estate of your late Grandfather. He will have to pay his own expenses.
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4. Well, he will have to sue the estate if he wishes to take it further. However, there is little chance of success for him.