Mom, sisters and cousin. Aunt Cora unfortunely isn't, she doesn't even appear, only references. While Caribdis had initial goals to include her, at the same time he had difficulties to include her in the plot with a decent storyline and without plotholes.
Nope, the Aunt is Cora, which Carla goes at the begining of the story to small "vacations", where she grabs the taxi and all that. She doesn't have screen time.
Rebecca may not be the aunt in game, but is in my heart though. I thought before of modding the storyline a bit to include that, but didn't have much time, as well I didn't want big plot holes. If I grab time I may try to do something, as long it brings attention to the game and doesn't change the storyline. And for rereading the game would be needed. But first, time is needed, along with less amount of laziness.