Estate Law Questions? Ask an Estate Lawyer.
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Yes, the descendants of any of your siblings who were alive at the time of your father's death would inherit their parent's share under the "laws of intestate succession" in Texas (subject to the 120 hour rule below).
Whether you sibling passed away before the estate was divided or probated doesn't matter, so long as they were alive at the time that your father passed away and remained alive for 120 hours afterwards. Texas has a 120 hour rule to determine whether someone "survived" a decedent. If they died within 120 hours of the other person then they are considered not to have survived them. If they didn't pass away until more than 120 hours later then they are considered to have survived them.