Originally posted by: Fraggable
Originally posted by: sixone
Tell her now. Whatever else happens, you don't want to add keeping this secret to your list of transgressions.
I found it entertaining that you assume he has a list of transgressions
But I'd have to disagree and go with the ignorance ploy for this reason alone: The girl will probably react in a negative way for no reason. Think about it, what real reason is there to break up with someone your cousin dated. Her initial reaction will be bad, but in the end it won't matter.
I normally advise complete honesty, but... for things that just don't matter?