Family health history is one of the predictors of your likelihood of getting these conditions. The risk of a coronary event is approximately doubled in individuals with a family history of CVD especially if at a young age.
If you can find out more about your history, it’s something your GP would probably be interesting in knowing if you haven’t shared these details. It’s also important to note that your history is only one predictor, you can always act to improve other areas of risk.