How do you handle an intestate death with minor children living with an ex-wife in another state?

Question Details: A man died and has 2 minor children living with a divorced wife out of state.The grandparent is trying to exercise control of the assets, valued at less than $100,000, no real property. Per the girlfriend, the wishes of the man were that everything should go to his children, but who has the power to assure this happens? What type of paperwork needs to be filed, and by whom and in which state? Ex-wife already filed something in Idaho and was denied to gain control of the estate. Minor children should be next of kin but how is this assured?

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