Family Ties/Jessica's room uninvited guest

You're standing in the middle of your room wearing nothing but socks when you hear it.

knock knock

You freeze and stare at the door.

"Yeah...?" you call out.

You almost made that sound like an invitation. There isn't a lock on your door. Would they just walk in? Who is it?

• Your twin brother Timmy
• Your older sister Heather
• Your older brother Jacob
• Your Daddy