Sister: If the Olympics happen in America can we go see them?

Me: You're gonna have to wait and see if New York puts in a bid for the 2016 Olympics.

Mom: 2016?

Me: London has 2012, remember?

Mom: Oh yeah.

Sister: Why New York? Because Daddy works there?

Me: Because it's close, doesn't matter whether or not Daddy works there.

Mom: (to my sister) And how old will you be in 2016?

Sister: Um... 15?

Mom: Think about it. What year were you born?

Sister: 2002.

Mom: So what's 2016 minus 2002?

Sister: Uhhh...

Mom: What's 16 minus 2?

Sister: Uhh... oh oh 14!

Mom: Right! So how old would [your brother] be?

Sister: Umm...

Mom: In 2016...

Sister: 27?

Mom: No! Think about it...

Sister: Umm...

Me: How many years older than you am I?

Sister: Uh, 10! No, 11!

Mom: He won't be 11 when you're 14!

Me: No, I asked her how much older than her I was.

Mom: Oh.

[Pause]

Mom: So have you figured it out yet?

Sister: 26!

Mom: Before you could do this much faster! I think your math is getting worse as you're getting older!

Sister: No! Okay okay wait... don't tell me the answer...

[pause]

Sister: Wait!

[pause]

Sister: Don't tell me the answer!

[pause]

Me: Okay, how about this. For every extra second you take solving this problem, you have to do an extra math problem.

Sister: (immediately) 25!