He said to his daughter: I’m going to divorce your mother
This is like saying: If my wife does not agree to travel, then I will divorce her. This does not count as a divorce, or as a conditional divorce depending on something that may happen in the future. If a person merely states that he will divorce his wife in the future, or promises or threatens to do that, that does not count as a divorce, according to scholarly consensus, because the divorce must be issued verbally, and it is not sufficient merely to promise or threaten to divorce her in the future. Similarly, the intention alone is not sufficient; rather it is essential to utter the words by means of which divorce takes place, and not merely state that one is going to divorce her.