The on-screen sisters were joined by cast mates Sean Berdy, Lucas Grabeel, Constance Marie, Lea Thompson and D.W. Moffatt.
Katie Leclerc and Vanessa Marano share a laugh as they speak on stage in the coursework of Disney/ABC Tv Groups portion of the 2012 Winter TCA Tour held at The Langham Huntington Hotel on Monday morning (January 9) in Pasadena, Calif.
Vanessa admitted in the coursework of the panel that Lucas picked up ASL faster than somebody else.
Katie actually taught me when they first started. I went to her, and he taught me signs every day. So because I fell in love with the language immediately and desired to learn as much as I could Lucas added.
But Vanessa isnt bad herself either, according to Sean. When they sign, I can understand her, he signed.

Two high profile organizations, GLAAD & Human Rights Campaign, are speaking out against a brand spanking new ABC comedy before the show even hits the air.
Work It, a sitcom set to premiere Jan. three, revolves around unemployed automobile salesmen played Ben Koldyke, Amaury Nolasco, who after their dealership shuts down, dress as females so they can get jobs as salespeople at a pharmaceutical company looking to hire female sales reps.
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The Gay & Lesbian Alliance Against Defamation & the HRC both say the comedy reflects negative transgender stereotypes.
The HRC is urging supporters to send emails asking the network to not air a show that reinforces negative & damaging stereotypes about transgender people.
The show doesn't claim to depict transgender people, & actually the network has called it an updated version of Bosom Buddies, but the groups don't see the humor.
"Transphobia is still all prevalent in our society & this show will only contribute to it, GLAAD acting president Mike Thompson said in a statement on the organization's net site.
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It will reinforce the mistaken belief that transgender females are basically men pretending to be females, & that their efforts to live their lives authentically as females are a type of lying or deception.