People in religious circles don't know much about moving graves. I feel I must respect it. You'd better find a local feng shui master, or go to the folk-custom section that Baidu knows.
The landlord of the following websites can refer to it, but I am not an expert.
:8080/sm/yuce/hdjr.asp
Looking for: Folklore Prediction > Choosing Auspicious Gregorian Calendar
Sometimes you have to respect others.
China pays attention to: one life, two fortunes, three geomantic omen, four ancestors and five studies.
If you want to change your life, look at it. If you want to be kind to your father, be kind to him. Better find a good time. If you can't find it, don't force it, release it more, and then go back to your father and accumulate some virtues for him.