If this is important to you then I would strongly suggest that you consult with a Fort Worth estate planning attorney to get it done correctly! Perhaps you would want to have the assets placed into a trust so that they do not go through probate court at death. A probate and estate planning attorney can give you the best suggestions based on your assets and family situation.
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Only in Louisiana is there a requirement to give portions of the estate to specific persons as a matter of law (so called "forced heirship"), except for the spouse. In all states a spouse has rights to take at least a portion of the estate of the deceased. In 49 states, other than the spouse there is no requirement to leave a portion of the estate to anyone, related or unrelated. There is also no requirement to name your grandchildren in your will. Sounds like you're writing your own wills and listening to old wives tales about what is and isn't required in a will. I recommend you talk to an attorney to get good advice.
Anyone who tries to draft language for a Will themselves has a very high probability of failure. Common sense will not work. Texas does not have a forced heirship law. But, to be certain of accomplishing what you intend to accomplish it is necessary that you consult with an experienced Wills and Estate Planning attorney.
DISCLAIMER: This is not specific legal advice and does not establish an attorney/client relationship.