Severus Snape

The memories also show that as a Death Eater, Snape had revealed to Voldemort a prophecy made by Sybill Trelawney, causing Voldemort to attempt to prevent it by killing Harry and his parents. Snape, who had not realised until too late that the prophecy was referring to Lily and her family, asked Voldemort to spare Lily. Still in terror for her life, he also approached Dumbledore, admitted his actions, and begged him to protect the Potters. Dumbledore chided him for thinking only of himself and not of Lily's husband and child, but agreed and ensured that they were placed under the Fidelius Charm. In return, Snape secretly allied himself with Dumbledore and the Order of the Phoenix as a double agent against Voldemort, using his powers of Occlumency to hide his betrayal from Voldemort. However, Snape demanded of Dumbledore that his love for Lily (his reason for switching sides) be kept a secret, especially from Harry, because of the deep animosity he felt towards Harry's father and his mixed feelings towards Harry (who reminded him of both his love for Lily Potter and her death, and his animosity towards James Potter). Dumbledore agreed and kept the secret throughout his life, although questioning Snape's request to ``never reveal the best of you''. Even with his efforts to protect her, Snape felt responsible for Lily's death at Voldemort's hands.

Question: is snape harry potter's father in the movie
Answer: no