When talking about interpretting emotions it depends on how well you know the person. If they a "day-one negroid" then you could interpet all emotions. assuming your not fake. However if thy just sus negroid happiness would be the easiest. just look for a smile:) hope this helps!!! have a gr8 day.
Positive family ties would lead to a greater sense of responsibility for one's self and one's family, so people with positive family ties are more motivated to engage in behaviors that lead to better health.