Legal Question in Family Law in Texas

Actually, the only person you can't normally completely "disinherit" is a spouse, due to the community property laws we have. Should your ex-husband desire, he could decide to disinherit his adopted daughter, his biological daughter, or both. If someone dies WITHOUT a will, and the state heirship laws apply (there's a very specific set of statutes that determine who gets what if you're married or not, have kids or not, etc.), in that case, an adopted child is treated the same as a biological child, but none of that applies with a will.