Good plan. My tack with my in-laws was to proactively expose my wife's affair, and then re-expose only key things (like the time she re-initiated contact, or big lies she was still telling), but other than that just answer THEIR questions with honesty and without sheltering my wife from the consequences of her infidelity.
"Always tell the truth, but you don't have to go around tellin' it" is a good motto to live by in the months that lie ahead of you.
