Mourners and family members of the deceased can use this thank you letter to respond graciously to condolences.
Dear {Recipient},
Thank you for taking the time out of your schedule to send me a letter of condolence after the passing of {the deceased}.
Things are slowly getting better, and just knowing that I have {friends, family members, coworkers, etc.} like you out there has been a great comfort to me in the past few {weeks, months, etc.}.
Again, thank you so much for thinking of me, and for knowing just the right thing to say.
Gratefully,
{Sender}