I honestly don't know a whole lot about the Kushner side of my family, but I know they came from what is now the Ukraine and my grandfather's name was Samuel and my father definitely has an aunt Ida.
Samuel lived in Haddonfeild, NJ and was married to Gertrude Slotnikoff (I might be spelling that wrong). He had two sons Howard and Paul (my father). He passed away sometime in the early 1960's. My father currently lives in Marlton, NJ and his brother lives in Atlanta, GA. That's pretty much all the info I have, but I know my Uncle Howard is into genealogy so he probably knows more. Hope this was at least somewhat helpful. If you'd like to discuss this further you can e-mail me at AEKushner@gmail.com.
P.S. If we're second cousins or something and you already knew all of this I apologize. Like I said I don't know the Kushner side of my family very well...