If I die, can I leave my property and assets to my children?

I don't know where you live and its an important consideration because each state has different rules about estates, etc. If you do not want anything to go to your wife, you must make up a Will that directs such a thing. However, remember that your wife always retains what's known as a "Right of Election" against your estate that allows her to receive up to one half of your estate regardless of what you say in your Will. Instead, you may be able to put everything into a Family Trust and that way exclude her from getting anything. However, for either one of those things you will need the help and assistance of an attorney. See one locally for additonal advice.

Washington is a community property state so everything (few exceptions) you acquire during the marriage are considered property of you and your wife. Separate property is the property you acquired before the marriage. You can decide who gets your separate property and you can exclude your wife (via a valid will), however, community property will become your wife's property. You may need to speak with a family law attorney.