Dear __________,
As you know, Bob and I have been suffering severe financial difficulties these past six months. We’ve been struggling through each day just trying to make ends meet, and trying to keep current on our rent and bills. As a middle-class family we never imagined we would wind up in the situation we’re now in, and our sense of pride has kept us from reaching out to family and friends for help. So when we received your generous gift, we were simply amazed at your love and thoughtfulness, and for coming to our aid in such a grand way just when we needed it most. Thank you so much for your prayers and support, and for your incredible gift. We remain hopeful that in the near future Bob will find employment, and our lives will take a turn for the better.
(YOUR NAME HERE)