How is ancestral and self acquired property is divided legally?

My grandfather in his will made the following divisions: 1. He gave one house to my uncle - This house was obtained by my grand father from his father as a gift in his father's will. 2. He gave his other self acquired (built himself) house to my father. From what i understand, the first division that my grandfather made to my uncle is not correct since it is an ancestral property. However, the second division that was made to my father is correct because this in a self acquired property. Is my understanding correct or are both divisions good in the eyes of the Indian law?