What your father has done by
giving the Sadaqah from the one-third of the bequest is correct and he did right. As for selling the bequeathed cattle, it is permissible for you to consider what is best to be done. If selling them is the best, sell them and buy a building, store, or date-palm trees with the paid amount, for that to be your mother’s Waqf whose income is to be spent in the way she specified in her will. But, if it is better to keep the cattle with your father, then it is not lawful for you to sell them. May Allah grant us success. May peace and blessings be upon our Prophet Muhammad, his family, and Companions.