After years of confronting people who "should" be confronted (I was the arbiter of all that is right, and all that is wrong), I no longer do so.
Step one is to remove them from my life. Step two if step one is not yet possible is to accept they are liars and make all decisions based on that going forward. Step three is to remove them from my life as quickly as possible.
Cyranoak
P.s. The biggest liar I know is my daughter. She is constitutionally unable to tell truth. Makes it easy to deal with her though.