My great aunt left me an inherentence but I can't get it until my father passes. Is there any way around this ?

Your question is incomplete. Why is it that you cannot get the inheritance until your father passes? Was it given to him with the remainder to you? IF that is the case, you have to wait, unless your father decides he wants it to go to you now, in which case, he can probably do what is called a "disclaimer" to let the inheritance go right to you. Good luck.