Grandfather died interstate does step wife of uncle has share property

My grandfather died intestate. He had two sons and three daughters. The elder son has two sons and three daughters. The younger son has one son and one daughter from deceased wife and one son from the alive step wife. Does the step wife and step son of my uncle have any right in my grandfather's property? And also do my grandfather's daughters have any right in the property? The elder son of my grandfather has been looking after house and maintaining it from many years.