"The loss of a mother leaves a void that words cannot fill. "I'm deeply sorry for the loss of your mom, you're in my thoughts and prayers." "Let me know what I can do for you. A proper condolence letter is many things. First and foremost, it is thoughtful and shows others that they are in your heart during their most challenging time. If you're at a loss for words, these thoughtful condolences and sympathy messages can help express your support to loved ones. "I'm so deeply sorry for your loss. Please know that my heart aches for you and your family during this unimaginable time of grief. Keep the letter as brief and as short as possible. Compliment the parents or siblings.