NU is NOT going to insist that the kid enroll at NU. Sorry…that’s just not going to happen.
I will add, however, the parents had to know the cost of NU when the kid applied ED. Were they on board with paying…because if not, the kid probably should not have applied ED. But what’s done is done.
At this point, if the NU offer isn’t sufficient financially, you decline the admissions offer. NU isn’t going to run down the road to Loyola and prevent you from enrolling there.