I really hope your dad will be o.k.
If there is one thing I want you to remember my father has had heart disease now since my brother was in 2nd grade, my brother is now 25.... my father has had quad drouple by pass surgery, Yes it was scary but remember outta that 50/50 chance remember 50 % is on his side .... Hope this helps...Hugssssssssssssss Have faith!