Okay, here's how i think the events in dante's life were:when he was very young(less than ten years) his father sparda died/dissapeared.When he was 10, his mother died at the hands of demons trying to save him while he was hidden in the closet(or was it something else?).He found his mother dead & coundn't see vergil anywhere so he thought vergil was dead too.He swore to hunt down the demons & became a demon hunter.8 years later,he met his so-called "dead" brother who was trying to unlock the door to the demon world.He fought his own brother to stop this but vergil dissappeared.One year later,they meet again,And the events of DMC3 occur(i won't go into details),Dante thinks Vergil is dead(Deja Vu) but 11 years later(20 yers after his mother's death)meets him as Nelo Angelo when the events of DMC1 take place.I won't say anytihng about DMC2,because it's not important,and i haven't figured out where does it fit in the timeline(butI am sure Dante's 30 up in DMC2).I guess Dante's in his early thirties in DMC4 as it most probably would be a sequel to DMC1.