Could my thick blood be something hereditary if 3 of my close family members have died before the age of 65 from strokes and angina?

Get a good medcheck: There is no medical entity called, "Thick blood". It is purely imaginry.You should know the normal blood cell numbers like Hemoglobin(Hb), white cell count(WBC) and Platelet count. If these are normal ,then your blood is considered normal(not thick). Premature deaths from Cardiovascular diseases is often due to known risk factors like high BP, high cholesterol, smoking, Obesity, diabetes & inactiv