If you want to disinherit one of your children, you will need to make this clear in your last will and testament. In your will, you can specify which of your children you want to inherit your assets, and you can exclude any children you want to disinherit.

It's important to note that simply not mentioning a child in your will is not sufficient to disinherit them. In most states, if you do not specifically disinherit a child in your will, they may be entitled to a portion of your estate.

Additionally, even if you do disinherit a child in your will, they may still have legal grounds to challenge the will and seek a portion of your estate. This can be a complex and difficult process, and it's important to work with an attorney to ensure that your will is drafted properly to minimize the chances of a challenge.

Overall, if you want to disinherit one of your children, it's important to make this clear in your will and to work with an attorney to ensure that your wishes are carried out.