Yeah, you definitely need to assess her ability to "hear" you if you interfere.
If you speak your mind, is there any chance at all that she will take it into consideration?
If you are wrong, and they stay together in wedded bliss, your interference will always be a dark cloud between you and your new bro-in-law. If you are right, and they are self-destructive toward each other, your interference will be an eternal silent "I told you so" between you and your sister.
I would stay out of it.
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