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You'll notice that Tristan is absent from the group shout-out. He, of course, shares a kid with Khloe Kardashian ... but got kicked to the curb after cheating on her (again).
Clearly, Caitlyn's not a fan of the guy ... none of the Kardashians seem to be at this point, frankly. Also interesting -- Khloe posted some cryptic messages ahead of the big holiday that one could interpret as being aimed at her baby daddy.
On her Insta story, Khloe posted stuff like ... "stop having relationship problems with someone you're not in a relationship with" as well as, "reminder: you cannot change a person who doesn't see an issue in their actions."
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The good news ... Khloe seems to have a decent co-parenting relationship with Tristan for the sake of their daughter, True. She told Laura Wasser recently that she keeps it cool with him and tries to keep any bad energy away from the kid.
Heck, she's even reunited with him since their split just to maintain the father-daughter relationship. When it comes to Father's Day though ... no love, apparently.