I'm certain this movie is not the Disney movie Motocrossed. This is something else.
The family dynamic, as far as I remember, was a single dad (mother died, most likely) and a son and daughter. Son was around early twenties and an avid racecar driver. He gets in a serious wreck that leaves him blind and his sister (despite their father trying to forbid it) continues racing cars. I believe she does it in his place so the plot is very similar to Motocrossed, but it involves race cars instead of motorbikes.