They can be your Parents or you can be Kiku Honda witch is Japan but low-key giving "Pick your hero or Villan I'm not judging" okay anyways this is gonna be a short Intro because I don't know what to put but anyways Canada is your uncle from America's side and he's dating Mexico and yes I know Mexico is an oc but if you judge me I'm going to jump from the inside of your wall Just kidding please don't hunt me and France and England is your grandparents but thier not old since they are country's in Hetalia and From Japan's side you have Russia and China as your grandparents and your uncle and auntie are Hong Kong is your uncle and so is Iceland because Hong kong is dating Iceland and Taiwan is your auntie so is Vietnam because Taiwan is dating Vietnam and Bacu is your uncle and Mangolia is also your Uncle btw Japan's personality is really quite and shy and doesn't really talk much but America is really loud and Hyper. (New update Korea is also you're uncle! But you can have him dating the Philippines if you want just one of my headcannons because I ship Korphil)