James has two godparents who are (of course) Hermione Granger and Ron Weasley, the kids' aunt and uncle
Sirius is more of a friend of Harry's. He was best friend to Harry's deceased father, James. James made Sirius Harrys' godfather.
Anthony
Because harry potters dad, James, had a friend called Sirius and Sirius was a werewolf and to keep Sirius company whilst he was a werewolf he learned to be an animagus.
*SPOILER ALERT FOR PRISONER OF AZKABAN* Sirius didn't actually betray the Potters at all, that was Peter Pettigrew.
No. Sirius Black was one of James Potter's best friends. Upon discovering that Voldemort was hunting them, the Potters' went into hiding, naming Sirius as their Secret Keeper, meaning he was the only one to know where they were. At the last moment, Sirius switches from this role with Peter Pettigrew, whom he believed they could trust. Pettigrew betrays the Potters' to Voldemort which results in Voldemort's murdering them, and pins it on Sirius.
Sirius Black
Harry Potter has 2 sons; James Sirius Potter and Albus Severus Potter
The oldest is James Sirius Potter the second oldest is Albus Severus Potter and the youngest is Lily Luna Potter
When Lily and James Potter decided to go into hiding using the Fidelius Charm, they were going to use Sirius, James' best friend, as the Secret Keeper, but at the last moment changed to Peter Pettigrew after Sirius suggested that Voldemort would never guess that Peter was the Secret Keeper. Peter, who was secretly a Death Eater, then betrayed the Potters. So the Potters' Secret Keeper was Peter Pettigrew.
Sirius Black was locked away in Azakaban prison.
At the end of Deathly Hallows, Ginny marrys Harry and has 3 children- James Sirius, Albus Severus and Lily Luna.
The elder one is James Sirius.The next one is Albus Severus and the younger one is Lily Luna.