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Assuming that James and Lily did not die then yes they probably would be fighting at the Battle of Hogwarts. However their death is the reason that Voldemort 'died' the first time and it was only when Voldemort returned that the Order restarted therefore creating the Battle of Hogwarts.

See if they didn't die Voldemort would still be around in their time and Harry wouldn't have a scar which also means Harry doesn't have the power to defeat Voldemort which may actually have meant everyone dies because Voldemort's not been stopped by Harry and no one else had the protection Harry did because of him having his mothers sacrifice and later a part of Voldemort in him. Thus making James and Lily's death the reason for everything else to have happened in the story.

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