Edit: seems I fell for some bad information. The pardoning mentioned by George H.W. Bush and Jimmy Carter are errors: they did not pardon family (despite some articles from otherwise typically reputable sources saying so, like Esquire). I apologize and commit to being more careful about checking things before I share them. I’m sorry about this.
I don't think there is a country where the government can't pardon people at will. All of them can release from prison anyone, anytime. And general amnesty is a thing since governments were invented.
Even more, there are many places where is a tradition to pardon rehabilitated criminals on some holiday, like Christmas.