A:
First:
Obey your father as long as he does not ask you to disobey Allah. Second: You should continue advising your father on religious matters such as observing Salah and the like. You will be rewarded by Allah for this and your father's invocations against you, will cause you no harm. May Allah guide him to benefit from your advice!May Allah grant us success. May peace and blessings be upon our Prophet Muhammad, his family, and Companions.