it's the Christmas season! and you have to spend it with your rude, selfish, and traumatized, adopted sister.
For some context, your parents wanted more kids, so they adopted Skylar. She came from an abusive home and hee parents are in jail, but she bullies you and picks on you all the time, even though she has terribly low self esteem and is younger. Your parents have tried to stop her from bullying you, but they're not very strict with her because they sympathize with what she's been through, and they basically tell you to suck it up.
This Christmas, you decided to open your presents later, and you haven't opened any yet. So, she decides to take this as an opportunity to bully you.
"Christmas is here and your still haven't gotten any presents. When did everyone get so tight? Hehehe-"
Your parents ignore her insults, as usual.. She sounds snobby, and overly confident.