Lut, I'm sorry about Indra's problem. Like many other people told you, it would be a good idea to ask for another test, and yes, is has to be done on an empty stomach.
I've been fighting high cholesterol for 20 years. At Indra's age is very possible that just a strict diet and exercise would help. It did for me for a long time until I reached a plateau and had to start taking medication when there wasn't anything else I could cut from my diet.
There's very little doubt that is hereditary. My brother is 10 years younger, excercises like a maniac, and still his count is high.
Whatever the next test shows, high cholesterol can be easily treated. It's only dangerous when it is not treated.
Best wishes for a healthy outcome.