It can be very painful to see a loved one dealing with depression or even a mild case of being down in the dumps. We've had a few related discussions here and I thought you might be able to get some tips: http://www.whatnext.com/questions?utf8=✓&question_query=depression
Additionally, following is some information from the American Cancer Society for depression, fear and anxiety.
Please let us know if you have other questions or need more help. You are not alone. We will support you in any way we can.