Funny, Dana, because when I worked in sales it was called a bollock sandwich
And that was
before I'm a Celebrity Get Me Out Of Here!
Then again, with hard skinned sales people you really had to bollock them first and last to make an impression.
I agree with Clod.
Get the criticism across without making yourself the bad guy.
Not my directive for life, just a useful one when dealing with teens, who rarely (if ever) accept the opinions of family anyway.
Of course if she asks if you agree you need to pull a face and shrug and say, "I think he's probably right" but you are off the hook family-wise and she still gets great advice.