Dear Queenie,
I have a cousin who lies about all the things he has done and how good he is at doing them. Mostly I keep quiet and don’t say anything, even when I know for a fact that he is lying or at least exaggerating, but I worry that my aunt and uncle might take his advice about their finances or let him fix their car, when I know these are some of the things he lies about.
Queenie, should I warn them about things like that?—Worried nephew
Dear Nephew,
Yes, but do so privately, when no one else is around to hear.
Tell them you are speaking to them about it because you are worried about the harm your cousin might cause. Then suggest that if he gives them any advice they should consult with a professional in the field (a financial advisor or attorney, for example) and if their car needs work they should take it to a professional mechanic.
Then all you can do is hope they take your advice.