Trust vs Will

My estate is fairly simple but I had a recent brush with unalivedness that scared me. I live in Nevada. As an unmarried woman with no offspring, my assets would go to my mother and if she were to pass, then my brother. I don't want that to happen in either case. I have two nephews that are in their teens that I want to inherit everything.

The bank account, investment, and 401k already have the boys listed as beneficiaries. The house and the vehicle are the only debts I have and the estimates listed below are AFTER deducting what I owe. I am not sure what should I do about everything else.

Should I set up a will and/or a trust?

Assets (conservatively):

• House worth $250k
• 401k worth $250k
• Bank and Small investment Accounts worth $40k
• Vehicle worth $12
• Jewerly, etc worth $25k

Any suggestions?