The fact that both of your parents are MDs I imagine has some bearing on your decision to apply to become a physician, and thus it should be mentioned along with other factors which influenced your choice. I also think that in this day when so many MDs are negative about medicine, the fact that you come from a medical family that must be positive, or at least you are positive, is appealing to physicians on the adcom. Of course medical school is not an old boys network where you'll get in because of your parents, but it should certainly be clear to the committee that you know well what the life of a physician may be. And your parents being doctors certainly isn't anything to be embarrassed about, so by all means, let the committee know if it makes sense to weave into your personal statement.