Austin Perlmutter

Austin Perlmutter is one of Annalise Keating's students and the son of medical examiner Sidney Perlmutter and Diane Roscoe on Castle and How to Get Away With Murder. He developed a strong dislike of Alexis Castle due to her actions in Philadelphia just like his father did with Richard Castle.

Alexis Castle
Just like his father Sidney disliking Richard Castle, Austin also has a strong dislike of Alexis Castle.

Sidney Perlmutter
Austin is Sidney's son from New York City. Austin is the only child of Sidney and Diane.

Connie Rawson
Connie Rawson is best friends with Austin since they first met.