This is a legal document that takes effect upon death and is used as an instrument to direct the disposition of your property upon death. A Will also serves the critical function of naming guardians for your minor children. In California, wills trigger probate unless the gross value of your “estate” is less than $166,250.00. When used in conjunction with a living trust, a will (then known as a “pour over will”) serves to leave assets not otherwise titled in your trust to your trust to determine the disposition of your property upon death.