Hi
your friend has strong family history of 
heart disease ,
so its advisable  to undergo routine health check up regularly and check up should include his 
cholesterol level , his blood sugar , his EKG and 2D echo and TMT test and further test should be guide by this basic test ,
and also he should start life style modification from now onwards,
advice your friend to follow this advice , 
 Take good quantity of fresh fruits , fresh green leafy vegetables , pulses, legumes , dry fruits like almond , wall nut , 
take whole grain food ,
restrict salt intake 
avoid saturated food item like fried food ,ghee , butter , red meat , organ meat like 
liver , 
kidney and sea food like prawns , crabs, egg yellow if you are non vegetarian 
avoid table salt , bakery items , fried food , sweets, ice cream .
Do regular brisk walking at least 30 to 40 minutes /day 
Quit any form of Tobacco if you are using, 
limit your alcohol intake,
take care