1. A document which is not signed or witnessed is not a valid will, even if it purports to be a will. Accordingly, this document which your brother's wife created in which she purported to leave everything to her son, is not a valid will. So it will not be admitted to probate. However, you should check with whatever solicitor dealt with the family affairs in case, this lady did in fact make a will. Or else, that she did get this document signed and witnessed with a solicitor. There is no central repository for wills, so a search with whatever firm(s) of solicitors she might have dealt with should be carried out. In that way, you can rule out the making of a will, if none turns up. Then the statutory rules of intestacy apply. However, if it turns out that your brother's wife did get this document signed and witnessed with a solicitor, then it will be a valid will. So be sure to carry out the necessary checks as it would be odd that she created a document but never got it done properly.