i have a will where a releative left some property and assets to my dad and i am his next of kin how do i go about getting the assets which is due my

As state law applies to these questions, you need to speak to an attorney licensed in your state to get a good answer. As a general statement, if your father was living when the relative died, you will be entitled to the assets given to your father, assuming your father didn't provide otherwise in his will. If he didn't have a will, as his next of kin you would get the bequest if he survived the relative. If your father did not survive the relative, you must read the relative's will to determine if his estate remains entitled to the bequest.