its highly dependent on how much your parents were making (just like everything else in life)
if you were brought up by a single moms who you said could quit her job after you got drafted, well.. you are gonna be covering her healthcare costs breh when that time comes. kidney failure? you could put her on medicare to cover it, but if you want more control over her dialysis, it will cost you at the very least $500,000 a year.
I bet things like that happen all the time if you come from rough beginnings. Even if its an uncle you haven't seen in 5 years you are going to be almost bound to pay certain costs for family and friends if thats how you came up. My dad used to do cardiology meetings for McNabb's camp and his colleague was a physician for the NFLPA. She said that the healthcare situation post retirement is pretty terrible and its pretty bad during the regular (off) season as well.
A lot of young people won't understand things like that, they need to invest on those things (retirement) early on and take care of their health and the health of their loved ones, that will be the biggest expense if you are in the NFL or you box or someshyt. If you aren't careful, you will definitely go broke.