No, Severus Snape is helping the Order of the Phoenix to bring down Lord Voldemort.
Harry Potter and the Deathly Hallows Part 2.
Yes
Yes. Alan Rickman reprised his role of Severus Snape in both part of Harry Potter and the Deathly Hallows.
Albus severus and Lily
Yes
Severus Snape
Severus Snape was headmaster in book seven: Harry Potter and the Deathly Hallows.
Harry Potter and the Deathly Hallows Part 2 . Albus Severus Potter . ^
James Sirius Potter, Albus Severus Potter and Lily Luna Potter.
James Potter is the oldest, Albus Severus Potter is the middle child and Lily Potter is the youngest.
Severus Snape put the sword at the bottom of a lake and then led Harry to it.
Severus Snape is the headmaster of Hogwarts in Harry Potter and the Deathly Hallows.