We all know by know Claire is really the daughter of the Nathan Petrelli. Nathan for almost all of the first season was this slightly evil, sly, deceptive guy who was the opposite of his good guy brother Peter Petrelli.
Peter was almost too nice. Nathan was a politician in New York running for office.
Claire met her biological family in Season One although briefly. I wonder whether Claire will meet up with Nathan again some time in the future.
I reckon Claire and Nathan will probably have to meet sometime towards the end of the season.
Nathan is never going to be father of the year to Claire but he is starting to warm to her slightly.
The biggest insight about Nathan was given by his Mum when she told him that underneath that gruff exterior there is a nice guy.