Congratulations on kids that get along with future step siblings. The "blended family" is always a challenge.
This is a so-called "morality clause." STRICLY speaking, you are the "guest" and don't have a "guest," however, when it comes to the best interest of the child, the Court may not be "amused" by strict constructionism. I have seen this point argued where the language was MORE precise (it said guest in the HOME) and the attorney for the other side still argued that it violated the "spirit" of the agreement. What you risk is a motion for contempt by your ex-spouse wherein they seek to impose on you a penalty for violating the agreement (or perhaps argue it as a grounds to modify your current arrangement). There is a possibility that the Court will NOT construe it strictly and therefore find you in contempt but, in general, the "uncertainty" that you are expressing may more likely result in an admonition from the court about how to proceed going forward (whether the court then awards your spouse fees for having to bring the motion is another issue). The fact that this is your bona fide financee may also be relevant.
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