"Mine is not a sponsored power, to be taken away at someone's whim. Upon my brow sits the ancient crown, taken in combat from the treasuries of Winter, yet, by right, meant for mortal men and holding no allegiance to the fae. Mine favor and wrath are for me alone to disperse, and none can compel my service without my agreement"
My concern is that that might seem too much like a challenge to their authority and/or that of the US government, and they may find that to be… unacceptable. They may choose to see us as a threat to their continued authority and power, and we don't yet have the sort of reputation and power that, say, Mab or the Senior Council has, where the government is unlikely to try and play fuck-fuck games with them. Even if they probably can't take us in a straight up fight, they can still screw us over in other ways. Thus, I think that us making a foe of them would be unwise.
On the other hand, lowballing or downplaying our power might lead them to think that they will be able to control us, and attempt to act accordingly. Again, they probably can't take us in a straight up fight, but they might attempt to gain power and/or leverage over us in other ways. At least some of those ways would put those who we care about most at risk.
Either path could end up being fraught with peril. Dammit, if our dad was able to be here, then hopefully they'd know better than to try shenanigans around a Knight of the Cross. We don't yet have that level of reputation to deter people trying to screw with us at all and, although we could still put the fear of Molly into them, that may also require going loud to some degree or another.
[X] Tell them the same story you did the Order of the Cauldron
It's not great, but it has the benefit of being consistent with what we've told others, if nothing else. Ideally, I would want to try and convey that we are both far too powerful for them to be able to fuck with without finding out rather quickly and messily, while also conveying that we, in fact, have no designs on their holdings, or anything of theirs, and do not intend to threaten them, but I'm not sure how well we can walk that tightrope.