Without knowing more, it is impossible to say. Probate of Wills is not automatic. Someone with an interest in the estate must come forward and seek to open the estate and have a personal representative (executor) appointed. If this has been done, you should be able to find out at the county probate court where the friend resided at the time of her death. If it has not been done, (and I expect that is the case, since your dad has not received notice), then nothing is happening, and that is a bad sign. If that is the case, your father should retain an attorney to investigate further.
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Since he is a friend, he is not automatically notified unless actually named in the Will (or trust). There are a few things to be done at this point. First, check with the probate court to see if the Will was lodged and/or probate case was opened. Second, check with the county recorder in any county where he may have owned property. In the alleged size of the estate, it would be unusual not to have a trust, which is handled without court supervision. You should be able to find out who the trustee is at least, if you don't already know. Then, get your dad to get a lawyer to help find out what is going on and what rights may exist pursuant to the documents. As a friend there are no ordinary rights to notification so it is possible that everything is being done correctly so far.
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First, ask the family if they are going to probate the will and if your dad can get a copy of it. If they refuse or ignore your request, go to the Stanislaus court and search for a probate in the friend's name. If there is no probate and your father believes he is an interested person, he can file a Petition with the court and give the family notice which will likely flush out the will. Generally if you have an attorney write a letter to the family, things will start to happen and the will should surface.