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Good afternoon thank you for your question, I am sorry to hear of your situation. When there is an issue such as this you would hope to find relevant correspondence to your mother in law as well as solicitors file notes, these days Will files are not destroyed.
Failing this, the view of the law is to consider what your mother in law would have wanted, in my view it seems to be she would have considered them all, as otherwise there would be a default clause stating that in the event the grandchildren died then their share to the great grandchildren, the fact that the groups are mentioned in the same sentence points to 'or' should be 'and'.
Well you could approach the solicitor, but people do change their minds when they are actually in the office giving instructions. These days people have computer notes going back years so it is surprising there is no record.
You would have to go to court to get the will altered as you cannot vary Will provisions unless all of the beneficiaries are adults. The money will have to simply be invested long term with probably annual reviews.
There is a procedure you can use to obtain information that may make them take notice? It is known as Larke v Nugus request and there are several sheets of questions surrounding the making of a Will, as laid down by the Law Society, usually used by people wishing to make a claim against the estate. However, if this succeeded they would have to compensate the beneficiaries who would lose out.
Yes, the difficulty is that draft copies are always sent to the clients to check through and ensure they are 100% correct but many clients either do not check at all or do not pick up on the small details, however, it is clearly badly drafted.
Do you need any further assistance?