I want to add my voice to Gary's in terms of getting a reference to a good psychiatrist and therapist if you believe there is difficulty with managing the depression. Anti-depressants/anti-anxiety meds (like many meds) may need tweaking to get to the right place. It's a big industry with many meds coming out regularly so it helps to go to someone who is up on the psychtropic medications.
There are also many types of therapy out there such as cognitive behavioral, stress reduction techniques,etc that work well alone or in conjunction with medication.
Also, don't underestimate how helpful it is to someone who may be depressed to know he has folks(like you ) that care!!!