I am sorry for your losses. I do agree you have a a cause for concern as you appear to have a family history of heart disease on both your Mother's and Father's side.
When people ask "is my heart healthy?" most often they want to know ~"Am I in danger of having a heart attack?" Remember, the absence of symptoms plus a normal physical exam plus a normal resting EKG does not answer this question! The best way to sort this question out is to have some type of stress test.
I would talk with your Dr. regarding your concerns and know ahead of time that there are several different types of stress tests. Also wondering if you have your cholesterol levels checked regularly ?
I hope this helps you in some small way and remember to always advocate for yourself.