Credit: Richard Cartwright /ABC Television Group © 2011 Disney Photo: Alexis and Rick Share a Father/Daughter Moment in Castle Season 5, Episode 9: "Secret Santa"

We still have a few months to go before Castle Season 6 premieres and we find out if Beckett will accept Castle’s marriage proposal, but should an engagement be in Caskett’s future, Rick’s on-screen daughter, Alexis, (played by Molly Quinn) is already thinking about how a potential union would change the family dynamic.

“I don’t think that Alexis will ever see her as a stepmom because a stepmother has authority,” Molly tells TVLine. “There’s no way that Alexis would be OK with that. She’s used to running the house. And not even her dad has that much authority. So she would see Beckett as an equal and she would totally appreciate [her]. But I don’t even think Beckett would ever try to [parent]. Alexis is an adult now. She’s 20.”

And while Alexis may be well on her way to adulthood now, Molly acknowledges that things would have been different for Rick’s only child had Castle and Beckett gotten together years ago. “If this had happened when Alexis was 16, that would have been a totally different story. I’m very glad that it didn’t happen because that would have been a lot of rebellion and a lot of trouble.”

If Castle and Beckett get engaged, do you think Alexis will handle the change well? Weigh in below!

Source: TVLine