Hopefully one should know their children well enough to know when they are overstepping their boundary.
Setting that aside- it all depends on the situation.
I think what it comes down to is if the person knows that what they are doing is wrong. When my in-laws came to visit shortly after we moved nearby my father-in-law pointed out that a mezuza or two was in the wrong place. Of course I’m happy he pointed it out. After spending close to $100 on each mezuza I might as well have each one in the right place.
On the other hand if I didn’t go to shul in the morning and my father-in-law would say something I’d probably feel differently.