Sister-in-law said how to reply when she came back from the trip.

Hello, I'm glad to answer your question.

You can say hello to your sister-in-law, then ask if there are any interesting things to talk about during the trip, and then let your sister-in-law have a good rest. Traveling is also very tiring. Thank you for your trust. The above is my reply. I hope I can help you and wish you a happy life ~