No Sandwich

So this is what I learn from Yisro.

That when it comes to fathers-in-law and sons-in-law, 1) a father-in-law can criticize his son-in-law as it says: Yisro saw everything Moshe was doing to the people and he said, what is this that you are doing? ... What you are doing isn't good!

2) That you can give unsolicited advice (maybe this applies only to fathers-in-law to sons-in-law).

3) That the advice does not have to be done with the "sandwich method," in which criticism is "sandwiched" between two positive comments.