What is the ruling on supplicating for deliverance from the injustice of an oppressive father, and does enduring it necessitate reward?

There is no harm in supplicating for deliverance from an oppressor, even if he is one's father, and this does not constitute disobedience. Enduring the father's injustice is rewarded, and the reward increases with bearing the father's harm, because patience with him and enduring his harm are acts of filial piety.