NRS 134.050: Surviving spouse and no issue; no surviving spouse or issue but parent.

1. If the decedent leaves no issue, the estate goes one-half to the surviving spouse, one-fourth to one parent of the decedent and one-fourth to the other parent of the decedent, if both are living. If both parents are not living, one-half to the parent then living.

2. If the decedent leaves no issue or parent, one-half of the separate property of the decedent goes to the surviving spouse and the other one-half goes in equal shares to the brothers and sisters of the decedent.

3. If the decedent leaves no issue or surviving spouse, the estate goes one-half to one parent of the decedent and one-half to the other parent of the decedent, if both are living. If both parents are not living, the whole estate goes to the parent then living.

4. If the decedent leaves no issue, parent, brother or sister, or children of any issue, all of the separate property of the decedent goes to the surviving spouse.