Daughter’s claim to Father’s Properties

My father’s last written will was in 2015 before his passing in 2017. In his will, he has given all rights to his properties to my mother. In 2016, however, certain plots of his properties were sold, signed by both my father and mother. He did not modify his 2015 based on the property changes. So, is his will valid/invalid? Currently, based on his will the properties belong to my mother. My fathers intention was for my mother to split the properties among the five heirs. However, now my mother has changed her mind and intends to only hand over the properties to her 2 sons, neglecting her 3 daughters. Can we as three daughters claim our shares of my fathers properties?