This natural disaster condolence letter can be used when someone's home and belongings are destroyed by a flood.
I was greatly saddened to learn about the flood on {date}. Such a senseless tragedy must be terrible to deal with, and I'm so sorry to hear about your home and your belongings.
I was glad to hear that everyone is safe and healthy, though. I hope that that remains a source of comfort to you, since your family is the one thing that can never be replaced.
I will call you soon to arrange a time to come help in whatever way I can. I'm so sorry for this difficult time.