Lots of people still ask me how to answer the hard questions? How to respond to the uncomfortable comments? I'll let you in on my son's strategy:
Little Bun, when asked "Is your sister adopted?" or "Is that your real sister?" has taken to clamping his lips shut and performing a Greek dance -- the first time he did it, he said it was the fastest distraction. Later, he could just remember having done it the first time.