Should Divorced Parents use Their Ex as a Threat?

Yes.

Absolutely.

Especially when it is an hour past bedtime for the fourth night in a row, and they STILL keep getting out of bed to tell you stuff like:

"Mom, did you know how Dumbledore dies?" (which V knows because she pretended she had to go to the bathroom and surreptitiously snuck her book in with her)

"Mom, I'm hot" (C)

"Mom, I'm cold" (C after I turn on his fan)

"Mom, D is making noise and I can't sleep" (V, after singing loudly to herself and being reprimanded)

"Mom, I need a drink" "So? You have four bottles of water on your desk" "But Mom, they aren't COLD..." (C and V, within mere seconds of each-other)

"Mom, I confess, C and I were playing rock/ scissor/ paper and ran back to our rooms when we heard you coming, but we promise to be good now and go to bed and not get up again" (which would mean a LOT more if this isn't the same thing I've heard on average 7 times per night for the past 4 nights)

So I do what I promised not to do, and say,

"Get up ONE more time, and I'm calling your FATHER!!!!"

Yeah, I know I said I wouldn't, but oh well... I'm sure X does the same thing, right?