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He does not have to leave her his entire estate. And while it is difficult to disinherit a child it is possible to do so if there are good reasons.
If the daughter is the one who decided not to have a relationship with her father then if the father leaves his estate to others the court may find that under the circumstances this is OK.
The father should be sure to have a lawyer draft his Will as the lawyer will know what to put in the Will to ensure the court understands what happened and accepts his reasons as valid.