My parents-in-law went out to travel and wanted to send a message of concern. What did you say?/Sorry? Thank you! !

Are your parents happy outside? It's hot now, so pay more attention to your health outside. If you are tired from walking, take more rest and drink more water. Go to bed early at night. Have fun. I want to go with you, but I can't leave work. I will go out with you next time.

But I think it's better to call. Chatting is better than texting.