You realise Vergil would of been too young to have been Nero's father, Nero, in Devil May Cry 4, is around 18, and Vergil is around 28-30, the user above was correct in saying Nero is only a host, because later on when Dante is talking to Nero about him keeping the sword, Dante seems to of figured out that Vergil is inside of Nero, so when he says about keeping the sword (Yamato, Vergil's sword) Dante is still keeping the sword in the family. If Nero was Vergil's son, Dante wouldn't of known, and I believe it would of played out differently.

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