Well, you have to pick your great, great grandparents. Then decide what nation they came from. That will decide what your great grandparents look like, so you can influence your grandparents. From that point you can choose Master Chief as your grandfather. Then you choose which alternate reality you want your grandparents to travel to, which influences your parents since the reality changing process changes their evolutionary state.
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Oh god not Gta 5 again!!! Plzz noooo!! THE HORRORRRR!!!