Lily and James have never gotten along throughout their time at Hogwarts. However, when they are struggling with events in their lives, they start to see each other in a different light.
Petunia Dursley is furious that she has been forced to care for her sister's son, and furious that he cries so much during the night. One evening, Petunia reflects on how she won't let Harry turn out like her sister.
Sirius Black and Remus Lupin are two very different boys, but perhaps their secrets, and their desperation to hide them, make them more alike than they know.