Each state has its own rules about intestate succession, which is the term for the rules of inheritance for those who die without leaving a will. You should consult with an estate lawyer in your local area to learn the rules for your particular state, especially where some of the immediate heirs (i.e. her children) have died. You also will want to learn how to commence the court process for distribution of her assets. In most states the procedures are fairly complex, and so you'll probably have to hire an attorney to help you sort things out and make the legally authorized distributions.