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On my quest to unite Ireland (my first real campaign), I was able to declare myself king and began a de jure war on all the counties not under my rule; the last one was Tyrone (which I had already created the duchy by this point since I had the other three counties). At some point Tyrone had been put under tribute to a dunchy in Scotland - how can I remove this? I can't use it as a CB against Scotland.
Or you could just leave it alone. It'll have little effect on you: the suzerain cannot call the Earl of Tyrone to war against his liege, nor can the Earl do the reverse unless he gets out from under the current Duke of Ulster.