In today’s Crimson, we're bringing you an in-depth look at two pairs of siblings–Petra B. Janney ’14 and Niall M. Janney ’12, and Alexandra M. Stanton ’14 and Michael J. Stanton ’13–who have more in common than just genetics. Not only are both pairs enrolled in the College, but they also compete together on the Harvard swimming and diving team.

After growing up together and now seeing each other at practices nearly every day, how much do these siblings really know about one another? We asked the athletic kin a series of questions, then challenged them to guess their sibling’s responses.

Most irritating habit?

Petra: Being attached to my Blackberry

Niall’s guess: Watching god-awful TV shows on TLC, MTV, VH1, etc., to the point that I have to wrench the remote away so I don’t tear out my eyes!

Niall: I am very fidgety and spit a lot.

Petra’s guess: Fidgeting with everything

Alex: Biting my cheek

Michael’s guess: Sucking her thumb

Michael: Biting my nails

Alex’s guess: Flicking me

Favorite movie?

Petra: Catch Me if You Can

Niall’s guess: Dodgeball