I Am Still Painting Flowers For You. (Alex Gaskarth)

Alice Barakat, Jack Barakat's "little" sister by an hour, moves back in with Jack and her mom when she finds out that her dad is remarrying her mom. Jack and Alice have never met before, only when they were first born. Alice finds out how good of a brother Jack is, and how amazing his band All Time Low is. She also starts having some major feelings for his best friend, Alex Gaskarth, the singer of the band.

*I don't own All Time Low, sadly...

Ps, I suck at summaries, sorry. Just read it, it's a good story.