1.“Half” —The 70:30 split you make when your mum tells you to share the last biscuit.
2.“Similar”—A resemblance in appearance that you emphatically deny exists, because you are obviously far better looking.
3.“Remote”—The little box that controls the TV, and is the cause of more fights than any other object in the household. If you have it and need to leave the room, it's perfectly acceptable to take it with you so that your sibling can't change the channel.
4.“Borrow”—Taking something that belongs to your sibling with no intention of returning it, and keeping it for so long that it basically just becomes yours anyway.
5.“Shower”—Something neither of you want to do until the moment the other one does, prompting a mad dash to the bathroom and then, almost inevitably, a fight.