it depends upon your father
1. if he is a Society Man -----then you are wasting your time "AT THIS TIME" perhaps later but now it is a waste of time
2. a person who has expressed soem concerns about the direction that jw seem to be going either locally or as an org
one of the most important qualities needed in any disussion is the need to be reasonable- typically your avg jw is much like a bank ATM Machine 3rd try on the wrong pin number and it shuts down
same with most jw as soon as thier APOSTATE DETECTOR goes off they shut down
so NO AMOUNT OF PROOF OR EVIDENCE WITH CHANGE A THING
AS YOU STATED "auguing with a jw" and that is the very first mistake
YOU NEVER WASTE TIME ARGUING WITH A JW
IF THEY are not reasonble to examine ANYTHING then you have lost before you even get started.
but one of the best ways is to stay off topic too hot LIKE BLOOD
a good one IN my view is Organ TRANSPLANTS- flipflop to show how god was suppose to have provided the very first NEW LIGHT on the matter then he is supposed to have changed light bulbs and now they have NEW NEW LIGHT
but keep in mind you will catch more flies with honey than vinagar
i would NEVER BE THE ONE TO START THE CONVERSATION ON WT ISSUES
And if they started i would start out treading very very lightly cause the worst thing you can do is SHUT THEM DOWN alsways remember it is harder to try and reopen up the dissussion with a shut down jw than to give them a little and just increase the doses each time
just a suggestion
james