Yes, he was actually beneath the Whomping Willow a couple of times in the story as an adult.
Severus Snape knew that Remus Lupin was keeping a secret and he was trying despreately to figure it out. Sirius Black thought it would be funny to help Snape and told him how to get past the Whomping Willow. Had James Potter not stopped Snape, Remus who had just transformed into a werewolf, would have killed him.
Dumbledore (or possibly Lupin) tells Harry the story of James Potter saving Snape in the third Harry Potter book, I believe.
Harry Potter has 2 sons; James Sirius Potter and Albus Severus Potter
Yes, Severus Snape stood for everything James Potter hated and he was also the best friend of the person James' loved.
James Sirius and Albus Severus Potter.
No, James Sirius was a year older than Albus Severus s forward sentence
Albus Severus Potter, Lily Luna Potter and James Sirius Potter
James, Albus Severus (Al) and Lilly
Harry and Ginny had two sons. The eldest of their children, James Sirius Potter, was named for Harry's deceased father, James Potter, and his godfather, Sirius Black. Their second son and middle child, Albus Severus Potter, was named for Albus Dumbledore and Severus Snape.
Yes, at some point during their years at Hogwarts, Sirius Black tricked Severus Snape and told him that if he was to go the Whomping Willow and press a certain branch he would see something. James Potter found out just in time and stopped Snape from going into the shrieking shack where he would have met Remus Lupin, in werewolf form.
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James Sirius Potter, Albus Severus Potter and Lily Luna Potter.