The life interest was it in a will and when he signed the will was he under medication and is it possible he could not understand?
Was the will prepared and signed in front of a solicitor?
Your children and you can contest the will and if he was not able to understand you have to provide evidence and you will need medical records
Being a short relationship she will have difficulty asserting her rights to a life tenancy.
You will need to appoint your own solicitors to do this and you have to move quickly. All costs usually come out of the estate.
You can also challenge the superannuation.
You should contact the Trustee and advise them of the challenge.
If it was a binding nomination you have to look at the time he made it and also his mental state.
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