As you can see in the background, her sister Chloe also won the silver in the SAME event. 

And her other sister, Maxime, was also in the event and made it past the quarterfinals!

More:

http://reddit.com/r/olympics/comments/1xdid7/these_two_canadian_sisters_just_won_gold_and/

http://olympics.cbc.ca/news/article/canadians-2nd-run-women-moguls-final.html

http://reddit.com/r/olympics/comments/1xdif1/canadian_sisters_justine_and_chlo%C3%A9_dufourlapointe/

Reddit comments:

http://reddit.com/r/pics/comments/1xdn0l/canadian_sisters_justine_chloe_dufourlapointe/

With their sister:

If they were on South Park:

On the podium:

Imgur comments: http://imgur.com/teabItU

Reddit comments:

http://reddit.com/r/olympics/comments/1xg33y/justine_dufourlapointe_experiencing_the_best/

Canadian reaction:

Reddit comments:

http://reddit.com/r/reactiongifs/comments/1xj5w5/mrw_the_canadian_sisters_won_gold_and_silver_in/

Reddit comments:

http://reddit.com/r/olympics/comments/1xoj9c/justine_dufourlapointe_kisses_her_sister_chloe/