Perna, I respectfully disagree. A white lie is not wishing yourself ill or disrespecting your sister-in-law. It's avoiding hurt feelings and saving yourself from needless anxiety. Have you never told a fib???

BBT7, of course, I would pass it by your husband first as it is his sister, and see what his thoughts are. Good luck. This thread sure picked up a bunch of opposing views. You're probably more confused than ever now.