Legal Question in Wills and Trusts in Texas

If the father had no will, then the illegitimate children would be entitled to a portion of the estate in most instances. (I'm assuming that the children weren't adopted, and the father didn't terminate parental rights.) If there is a will, then the will would normally control. As for proof, a potential claimant can file an action in probate court called a "Motion to Determine Heirship" and a judge will determine the heirs of a deceased person.