Booth and Bren have a baby girl named Christine if I'm playing her from current season. I think I mentioned in a tag that Christine is back in D.C. being babysat by Max (Brennan's dad). So yes, it would be obvious they're together. Not a secret for them.
Brennan, however, would not be able to pick up on anything between Castle and Beckett. But I might say that Booth suspected (since it's the sort of thing he would suspect) and she'd be Brennan enough to bring it up.
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Booth and Bren have a baby girl named Christine if I'm playing her from current season. I think I mentioned in a tag that Christine is back in D.C. being babysat by Max (Brennan's dad). So yes, it would be obvious they're together. Not a secret for them.
Brennan, however, would not be able to pick up on anything between Castle and Beckett. But I might say that Booth suspected (since it's the sort of thing he would suspect) and she'd be Brennan enough to bring it up.