My dad had heart attack at 35 still alive , my mum has not heart problems am i at risk i'm 30?

Yes: If your dad had a heart attack in his thirties, you need to be screened with a thorough cholesterol profile for Familial Hypercholesterolemia, which has an incidence of roughly 1/250 people and can place you at increased risk of premature vascular disease as well. The good news is that there are many treatments available, including some amazingly successful new ones. Good luck!!