Dr. G is a very clean show, the worst portions being in how some of the people died, whether it was related to substance abuse, suicide, murder, or some freak happening. At worst, a parent or older sibling may have to explain what an anatomical term is [seldom a sexual part; usually something along the lines of aorta]. Dr. G herself is a very positive role model, a working mother who promotes living healthy in a myriad of ways from exercise, avoiding substance abuse, and eating healthy to simply getting enough sleep or going to your doctor regularly.
My younger brothers watch it frequently and find it some of the best non-cartoon programming available aside from Mystery Diagnosis.