Extract the answer to the following question from the movie plot. If the question isn't answerable, please output "Can't answer". Question: What did the siblings agree to do? Title: Gray Matters Movie plot: Gray Baldwin (Heather Graham), a family oriented and quiet bachelorette, lives a close-knit life with her brother, Sam (Tom Cavanagh). Their lifestyle is generally co-dependent, involving them living together, going to dance classes together, etc. Gray and Sam's relationship has never been thought of as strange, but once a dinner party guest mistakes the siblings as a couple, Gray and Sam decide to venture outside of one another. While discussing with each other what they can do about their single lifestyles, and how they can "hook each other up" with a significant other, their conversation continues to the park, where Gray spots a possible girlfriend for Sam, Charlie Kelsey (Bridget Moynahan). Gray introduces herself, then Charlie to Sam, and they instantly bond, agreeing to see each other again. To Gray's surprise, Charlie and Sam become engaged the morning after their meeting. Charlie and Sam are so madly in love with one another, they plan to go to Las Vegas the following morning and elope there, and invite Gray along. Gray is a little hesitant, but agrees when Charlie says they can have a "mini bachelorette party". Gray agrees and the three make their way to Vegas. While in Vegas, Gray takes Charlie out for a hen night, and after many drinks, the two share a drunken but passionate kiss. The next morning, Charlie doesn't remember anything, but Gray hasn't slept the whole night, due to the bond she felt with Charlie. The situation makes Gray finally realize that not only is she attracted to women, but is falling in love with her sister-in-law. The events in Vegas force a journey of self-discovery, testing the relationship between two very close siblings, and to finding happiness in lonely Manhattan. When Gray eventually 'comes out' to Sam, he tells her he's known all along, since they were young kids. Later, Sam accidentally discloses Gray's orientation to her entire office, which, along with Sam's encouragement, gives her impetus to move on to further self-actualizing.
Answer:
Can't answer