Do my parents have an alcohol problem?

I am slightly concerned about my parents drinking habitats, but unsure if I am being overly cautious. I moved back home with my parents 5 months ago, and within that time I have not seen my parents go one day without drinking. Every evening they have on average 2 glasses of white wine with dinner, and then red wine afterwards when they watch TV. I am not sure if this is normal and if I should be concerned. Does this sound like an alcohol problem?