How do I include step children in my will just as I do my children?

Dear North Carolina, Your endeavor to put your wishes down in a formalized legal document (a will or trust) is your best guarantee for ensuring your wishes are followed.  If you die without formalizing your wishes in writing, your stepchildren would not be entitled to inherit from you.  Whatever they'd receive would be by the mercy of your biological children.  If your state allows for the inclusion of no-contest clauses, I'd recommend one for your will just in case your step children and biological children secretly do not like each other.  A no contest clause says if you contest the will's provisions then you get nothing at all.  Hope that helps and best of wishes with everything.  Your children (all of them) sound really blessed to have you for a parent.