The Anders family was...something in Celeste's early years.
Her parents had not at all accounted for the simple fact of her existence until it was staring right at them; they prepared the house and tended to her physically, but mostly they just pawned her off to Josh (17), Delia (12), or Laura (9) or left her to her own devices. Celeste was already very temperamental by nature, and this was exacerbated by the fact that no one exactly taught her how to behave and that she could turn vicious in search of attention. Her daycares would regularly call or send notes about her most recent disruption, which frequently involved any combination of her kicking, biting, hitting, scratching, throwing things, or knocking over chairs. None of the facilities could keep her for long, and she was once again treated as a problem for Delia and Laura to deal with. (Josh had moved out by then and was thus able to escape this.) Neither of them were exactly the most patient with her (the whole situation was one they didn't appreciate--they didn't really want to make it easy for their parents to do nothing) but managed to argue, threaten, or punish her into line. Delia and Laura moved out at 18 with the mentality of "I'm leaving this hopeless Anders household as soon as I possibly can," and Celeste plans on doing the same. Overall, the Anders family operated something along these lines with regards to her.
(The Anders parents were probably better with Josh, Delia, and Laura at first when they had enough energy for all of them--which is not remotely to excuse them, but just a side note.)