You are best served by having an attorney at least review what you put together. You need to consider the tax implications (gift and inheritance taxes) for only having a will or only having a trust. If you wish to disinherit your one child and not the other, there are provisions you can place in the documents to specifically indicate you are disinheriting him or her. However, you cannot then create a document (trust or will) and have the other child serve as trustee to the other child to ensure proper spending is taking place; you either disinherit or you create a spendthrift trust. If you create a will and specifically disinherit the child you can also embed a provision that states the child cannot contest the will. Between those provisions, you should be okay.