Two quotes from Harry Potter and The Prisioner of Azkaban

"Now, my three friends could hardly fail to notice that I disappeared once a month. I made up all sorts of stories. I told them my mother was ill, and that I had to go home to see her... I was terrified they would desert me the moment they found out what I was. But of course, they, like you, Hermione, worked out the truth....

And they didn't desert me at all. Instead, they did something for me that would make my transformations not only bearable, but the best times of my life. They became Animagi."

Remus Lupin, unravelling about his past.

"I'll understand, of course, if you want to stay with your aunt and
uncle. But... well... think about it. Once my name's
cleared... if you wanted a... a different home..."

Sirius Black said to Harry, on their way back to Hogwarts.