I offer my condolences on the passing of your father and pray for his soul's happiness and a successful life in the hereafter. His journey in this world was only as long as God had destined for him.

I can understand your grief, and I request that you also pray for him, as he must have prayed for you many times in this world. Now, it's your responsibility to pray for him, as he only needs your prayers.

May Allah grant him a high rank in Jannat ul Firdous (the highest level of paradise). (Amen)