Dear X,
We are extremely sorry to hear about XXX's passing. We cannot imagine how you feel at this time. XXX was a kind person to us, and we had the pleasure to know him. He will be very much missed.
Our heart goes out to you and XXX is in our thoughts and prayers. We know you will be through this time, just XXX would want you to do. We will be praying for you.
If you need help in any way, please let us know.
With all our sympathy and love,
XXX and XXX
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