Most of the time when I hear people that depend on luck, they are a little lazy and lack effort in order to have better lives. Probably because whether they work hard or not, fate will determine their success, which is not a good mentality. Your uncles have the same mentality on luck but their stories are different, they work very hard which is commendable and they really deserved to be where they are now, successful businessmen.

For me, luck is like 50/50 so we better not depend on it. Let's say that a hard worker has much bad luck in life, he will continue to live normally or a little below that line compared to a lazy person with strings of bad luck in life.