m guessing that the slightly high cholesterol level is a risk
factor, hypertension is indeed a risk
factor, family history of heart disease
is very much a risk factor. You didn't mention, but your exercise pattern, smoking history, BMI, diabetes, dietary habits and stress levels all factor in as well. However, you have three definite risk factors.
I'd suggest you read up on risk factors for heart disease, and work to correct any obvious risks. For example, if you smoke, stop.