If a person died intestate in Idaho, or in any other state for that matter, "step-THIS, or step-THAT" aren't in the list of those who stand to inherit the estate of the deceased.

Read the laws of intestacy in Idaho, and talk with a lawyer about what your legal optiosn might be:

https://adacounty.id.gov/Portals/0/CortAssistOff/Doc/Q_A_Wills.pdf

Who Inherits in Idaho When There's No Will?

Idaho Intestacy Laws